Recently, i installed ubuntu server 20 64bit on Raspberry pi 4 B+ 4GB model, and youtube is laggy so i searched a bit and installed raspi-config and tried to change memory split setting but it says i don't have vcgencmd installed I tried many things to install vcgencmd i tried building userland, i succeed to build it, and i see vcgencmd is in /opt/vc/bin, but when i use

$ /opt/vc/bin/vcgencmd

it says it can't find vcgencmd I'm sure that there wasn't any typo, because i used tab auto correction i also tried installing libraspberrypi-bin, but it says it is not available i tried

pip3 install vcgencmd

it installed successfuly, but when i try to use it, it says

Traceback (most recent call last): File "/usr/local/lib/python3.8/dist-packages/vcgencmd/init.py", line 20, in subprocess.check_output('vcgencmd') File "/usr/lib/python3.8/subprocess.py", line 411, in check_output return run(*popenargs, stdout=PIPE, timeout=timeout, check=True, File "/usr/lib/python3.8/subprocess.py", line 489, in run with Popen(*popenargs, **kwargs) as process: File "/usr/lib/python3.8/subprocess.py", line 854, in init self._execute_child(args, executable, preexec_fn, close_fds, File "/usr/lib/python3.8/subprocess.py", line 1702, in _execute_child raise child_exception_type(errno_num, err_msg, err_filename) FileNotFoundError: [Errno 2] No such file or directory: 'vcgencmd'

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File "/usr/lib/python3.8/runpy.py", line 184, in _run_module_as_main mod_name, mod_spec, code = _get_module_details(mod_name, _Error) File "/usr/lib/python3.8/runpy.py", line 143, in _get_module_details return _get_module_details(pkg_main_name, error) File "/usr/lib/python3.8/runpy.py", line 110, in _get_module_details import(pkg_name) File "/usr/local/lib/python3.8/dist-packages/vcgencmd/init.py", line 22, in raise ImportError('\'vcgencmd\' does not exist in path') ImportError: 'vcgencmd' does not exist in path i used raspi-update to update firmware, and there was no problem updating firmware but i still can't use vcgencmd can anyone help me?

  • I installed ubuntu-desktop on ubuntu server, since there isn't any desktop ubuntu 20 for raspberry pi 4 right now
    – tmvkrpxl0
    May 3, 2020 at 16:43
  • What's the output of ldd /opt/vc/bin/vcgencmd?
    – tttapa
    May 3, 2020 at 16:47
  • 1
    You need to add /opt/vc/bin to $PATH. en.wikipedia.org/wiki/PATH_(variable)
    – goldilocks
    May 3, 2020 at 17:12
  • output of ldd /opt/vc/bin/vcgencmd is "it's not dynamic executable file" I use different language setting, so text could be different
    – tmvkrpxl0
    May 4, 2020 at 4:44

1 Answer 1


There are two problems here: 1. vcgencmd cannot find its shared libraries, and 2. the Python module you're using cannot find the vcgencmd executable.

There are two possible solutions to the first problem:

A. Set the rpath of vcgencmd when building the Userland project:

cmake \
    -DCMAKE_INSTALL_PREFIX="/opt/vc" \
    <your usual options>

B. Add /opt/vc/lib to the path of the dynamic linker/loader:

echo '/opt/vc/lib' | sudo tee /etc/ld.so.conf.d/vc.conf
sudo ldconfig

The second problem is that the folder /opt/vc/bin is not in your PATH. There are many possible solutions, but you probably want to add it to the system-wide path:

echo 'export PATH="/opt/vc/bin:$PATH"' | sudo tee /etc/profile.d/vc.sh

Afterwards, reboot, or execute the command export PATH="/opt/vc/bin:$PATH" in the shell you're starting the Python program from.

  • I did both, but i still have problems, when i use vcgencmd, now it says it can't find "/opt/vc/bin/vcgencmd: error while loading shared libraries: libvchiq_arm.so: cannot open shared object file: No such file or directory" and i still get same issue on python
    – tmvkrpxl0
    May 4, 2020 at 6:50
    – tmvkrpxl0
    May 4, 2020 at 6:51
  • Sorry, i did something wrong, and it's working fine, Thanks!
    – tmvkrpxl0
    May 4, 2020 at 6:53
  • This is it. Just added a ../bin to PATH and a ../lib to LDCONFIG and everything worked OK
    – A.Ametov
    Jun 25, 2021 at 9:34

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