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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchCGMiner on Ubuntu is primarily a command-line control program for compatible Bitcoin ASIC and FPGA miners. It is not a practical way to mine Bitcoin with an ordinary laptop or desktop GPU. Before installing it, confirm that your exact hardware and algorithm are supported by your CGMiner build; then connect a pool, verify accepted shares, and account for electricity and cooling costs.
What CGMiner can—and cannot—mine
The current upstream project describes CGMiner as an ASIC and FPGA miner for Bitcoin. It connects compatible hardware to a pool or node, receives work, and displays hashrate, submitted shares, device status, and other operating information. Its interface is interactive, and it accepts command-line options or a JSON configuration file. See the upstream CGMiner project.
Bitcoin mining uses the SHA-256 algorithm and, in practice, requires specialized ASIC hardware. Current upstream CGMiner should not be treated as a modern general-purpose GPU miner. GPU instructions found in older guides may describe historical releases or separate forks. Other coins are possible only when the coin’s algorithm, the exact device, the CGMiner build, and the pool all support one another; changing the pool URL alone does not make a miner compatible.
Check hardware and operating conditions first
Establish what you have before installing software. CGMiner device support depends on the model, driver compiled into the program, firmware, and connection method—not just the manufacturer’s brand. The upstream ASIC documentation names a range of supported and historical devices, but its list is not a guarantee that every model or build will work.
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- Identify the device and algorithm. Confirm the precise model, whether it is an ASIC or FPGA, and which algorithm it mines. A standard AMD or NVIDIA desktop GPU is not a suitable reason to install current upstream CGMiner for Bitcoin mining.
- Check how it connects. USB and serial devices need Ubuntu to recognize and authorize the hardware. A network ASIC may have its own controller and miner software; Ubuntu may be needed only for management.
- Confirm power and cooling. Use a suitably rated power supply, adequate ventilation, and the manufacturer’s operating limits. A miner can draw sustained power and produce considerable heat and noise.
- Arrange pool and payout details. For pool mining, obtain the pool’s current endpoint, port, worker format, password convention, protocol requirements, and payout setup from its own documentation. For payouts, configure the required account or wallet details with the pool.
Small USB miners are generally hobby or educational devices, not a substitute for industrial-scale Bitcoin mining. A laptop, Raspberry Pi, or ordinary desktop cannot compete with modern SHA-256 ASICs.
Install CGMiner from Ubuntu’s package archive
The distribution package is the simplest option if it exists for your Ubuntu release and includes the driver your device needs. First check the candidate version:
sudo apt update
apt policy cgminerIf a candidate is available, install and inspect it:
sudo apt install cgminer
cgminer --version
cgminer --helpPackage availability and device support differ by release. For example, Ubuntu’s Jammy package listing identifies version 4.9.2-1ubuntu1 in the universe repository; that does not establish the package version or availability on other releases. Check the listing for Ubuntu Jammy’s cgminer package and your own release. If apt cannot locate it, refresh package metadata and check whether universe is enabled; do not assume a Jammy instruction applies unchanged to another Ubuntu version or derivative.
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Build from source if the distribution package is unavailable, too old for your device, or lacks a required driver. This gives you configuration control, but compilation alone does not guarantee that a particular miner is supported. Use the official CGMiner repository, inspect the configure options and output, and confirm the required device driver is included.
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On Ubuntu releases where these dependency package names are available, a typical build sequence is:
sudo apt update
sudo apt install build-essential autoconf automake libtool pkg-config
libcurl4-openssl-dev libudev-dev libusb-1.0-0-dev libncurses-dev git
git clone https://github.com/ckolivas/cgminer.git
cd cgminer
./autogen.sh
CFLAGS="-O2 -Wall -march=native" ./configure
make -j"$(nproc)"
./cgminer --versionDependency names can vary across Ubuntu releases; if installation or configuration reports a missing requirement, install the development package named in that error using the name available for your release. Some devices need an explicit configure switch, such as a driver-specific --enable-… option documented by the project. Review configure output and ./cgminer --help to establish what this build actually includes.
For a first test, run the binary from its build directory rather than installing over system-managed files. If you decide to install it system-wide after confirming the build, upstream documents:
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sudo make install
command -v cgminer
cgminer --versionUse third-party binaries or vendor forks only when there is a specific compatibility reason. Verify the publisher and distribution channel: an untrusted miner binary can put the system and pool credentials at risk.
Let Ubuntu access the miner without running CGMiner as root
Connect and power the device according to its manufacturer instructions. For USB hardware, check whether Ubuntu sees it:
lsusb
dmesg | tail -n 50For a serial-style device, inspect its device node and your group memberships:
ls -l /dev/ttyUSB* /dev/ttyACM* 2>/dev/null
groupsSome serial devices require membership in dialout. Add your user, then log out and back in (or begin a new login session) before trying again:
sudo usermod -aG dialout "$USER"This is not a universal fix: many ASICs use raw USB rather than a /dev/ttyUSB* node and may need a device-specific udev rule. Ubuntu’s udev documentation explains device management, while the historical CGMiner Linux guidance discusses serial permissions. Avoid making sudo cgminer the routine solution; it masks permission problems and gives mining software unnecessary privileges.
Connect to a pool with its current Stratum details
Get the mining endpoint and account format directly from the pool’s official instructions. A dashboard address is not necessarily a mining endpoint. Check the algorithm, hostname, port, whether TLS is required, and the exact worker naming convention. CGMiner’s standard Stratum command form is:
cgminer
-o stratum+tcp://POOL_HOST:PORT
-u USER.WORKER
-p xReplace every placeholder with values supplied by the pool. The sample password x is a placeholder convention used by some pools, not a universal password rule. If the pool requires TLS or another credential format, follow its current documentation. The upstream project documents the stratum+tcp:// form and command-line options at github.com/ckolivas/cgminer.
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Start with one device and one pool. Do not add overclocking, fan tuning, multiple pools, or API exposure until a basic connection works. CGMiner accepts repeated pool options, but listing a second pool does not by itself promise load balancing; selection and failover depend on pool configuration and CGMiner settings.
Use a JSON configuration file
For repeat launches, store the pool settings in a configuration file. This minimal example uses placeholders:
{
"pools": [
{
"url": "stratum+tcp://POOL_HOST:PORT",
"user": "USER.WORKER",
"pass": "x"
}
]
}Save it as ~/cgminer.conf, substitute the pool’s actual values, and restrict access to the file before launching:
chmod 600 ~/cgminer.conf
cgminer --config ~/cgminer.confKeep credentials private. Check the installed build’s cgminer --help and upstream documentation for supported configuration options; configuration details can vary by build. If you save settings through CGMiner’s interactive interface, the program can load the saved configuration on a later launch.
Verify the miner is doing credited work
After launch, allow time for the device to initialize and the pool to begin sending work. In the CGMiner interface, check that the device appears, the pool is connected, and the hashrate rises above zero. Monitor these indicators while it runs:
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- Accepted, rejected, and stale shares.
- Device hashrate and hardware errors.
- Temperature and fan behavior, compared with the device manufacturer’s limits.
- Pool connection status and any device resets.
A displayed hashrate alone does not establish earnings or pool credit. Confirm that the worker is active and accepted shares are appearing on the pool’s dashboard. If the dashboard does not show activity, troubleshoot the endpoint, worker credentials, device support, and connection rather than treating the local hashrate as proof of success.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshoot common installation and mining failures
| Symptom | What to check | Recovery |
|---|---|---|
Unable to locate package cgminer |
Stale package metadata, disabled universe, or a release that does not provide the package. |
Run sudo apt update and apt policy cgminer; check the package listing for your exact Ubuntu release. Build from the official repository if needed. |
./autogen.sh: command not found |
Autotools or build tools are missing. | Install autoconf automake libtool pkg-config build-essential, then rerun ./autogen.sh. |
| Configure reports missing package requirements | A development library is absent, or its package name differs on this Ubuntu release. | Install the development package named in the error. Common categories include curl, udev, USB, and curses development libraries. |
| No devices detected | Power, data-capable cable, permissions, another miner claiming the device, firmware, or a missing driver. | Check lsusb and dmesg | tail -n 50; test one device, confirm the build’s driver support, and consult the device documentation. For a network miner, check IP connectivity instead of USB enumeration. |
| Permission denied | Device ownership, group membership, or a missing udev rule. | Inspect the device node and groups. For serial devices, add the user to dialout and start a new login session; for raw USB, use the appropriate udev permissions rather than routinely running as root. |
| Pool connection fails | Hostname, port, protocol prefix, firewall, worker format, or TLS requirement. | Check name resolution with getent hosts POOL_HOST and verify every connection value against the pool’s current instructions. Do not use a web dashboard URL as a Stratum endpoint. |
| CGMiner starts but hashrate stays at zero | Device initialization, incompatible firmware, or a build without the required driver. | Inspect cgminer --help and configure output; verify the exact model is supported by the build and start with one device. |
| Shares are rejected | Wrong algorithm or endpoint, incorrect credentials, stale work, outdated firmware, or unstable/overclocked hardware. | Return hardware to stock settings, verify pool details and worker syntax, and check the pool’s status. |
| Hardware errors rise or device resets | Overclocking, excess temperature, inadequate power, defective hardware, or an unstable USB connection. | Stop the miner, restore manufacturer clock and voltage settings, check cooling and PSU capacity, and test one device at a time. |
| Configuration file fails to load | Invalid JSON, smart quotes, missing commas, wrong keys, or malformed values. | Use plain quotation marks, validate the JSON syntax, restrict file permissions with chmod 600, and retry with a single pool entry. |
Understand the financial and safety trade-offs
CGMiner being free does not make mining cost-free. Estimate the full economics before leaving hardware running:
Net result = mining revenue
- electricity cost
- pool fees
- hardware cost allocation
- cooling and infrastructure costsRevenue depends on the miner’s hashrate and uptime, network difficulty, Bitcoin price and block subsidy, and the pool’s payout method and fees. Costs include power draw, electricity rates, hardware depreciation, ventilation, and any infrastructure or hosting charges. No single profitability figure applies without a specific machine, power consumption, electricity price, fee assumptions, and date. A pool can smooth payout variability, but it does not guarantee profit; solo mining is even less predictable for a small miner.
For electrical and thermal safety, use hardware and cabling rated for sustained load, provide clear airflow and exhaust, and follow manufacturer temperature and shutdown limits. Do not disable thermal protection to chase hashrate. If the miner’s sustained load exceeds what your electrical setup can safely support, do not run it there.
Choose the right mining setup for the job
- Use Ubuntu with CGMiner when you have compatible ASIC or FPGA hardware and need to configure or operate a supported build.
- Use a network miner’s own interface when the ASIC already runs its mining software and Ubuntu is only needed for monitoring or administration.
- Use vendor software or a device-specific fork only when your exact device requires it, and assess its maintenance, security, and source before trusting it with credentials.
- Choose a GPU-specific miner for a GPU algorithm only after independently verifying the software, algorithm, and pool support; current upstream CGMiner is not the generic GPU choice described by many older tutorials.
Running a Bitcoin node does not make solo mining likely to find a block. A node can supply work to a solo miner, but the miner still competes against the network with its own hashrate and uptime; solo mining is best treated as an experiment unless the scale supports the risk.
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