Did your Blender desktop application become unresponsive and refuse to close or reboot?

On Ubuntu, you can force quit the Blender application by using the pkill command in your terminal.

If you don't already have a terminal window open, you can open one with the CTRL+ALT+T keyboard shortcut.

Then, execute this command in your terminal to kill all processes running Blender on your machine:

    
      sudo pkill -9 blender
    
  

This command runs the pkill command with the -9 option, which is the SIGTERM signals used to tell a process to terminate.

After successfully running that command, all the instances of Blender running on your machine should now be closed and terminated.

If you don't want to kill all the Blender processes running on your machine, you can also kill individual processes. To do this, you need to first list out all the PIDs (Process Identifiers) running Blender and then use the sudo kill -9 PID command to kill that specific process.

You can list all the processes running the Blender with this command:

    
      ps aux | grep blender
    
  

The command uses ps aux to get all the processes running on your machine and then grep blender to filter out everything but processes running Blender.

This will output something that looks like the following:

    
      nick      5248  6.9  0.8 1053480 138108 ?      Sl   18:25   0:00 /usr/lib/blender/blender ...
    
  

The first number you see in the output after the username (5248 in the example output above) is the PID for that specific process.

You can also modify the output to only show the PID numbers:

    
      ps aux | grep blender | awk '{ print $2 }'
    
  

This output will look like this:

    
      5248
      8842
    
  

Now that you have the PID/s for the process running Blender, you can end it with this command:

    
      sudo kill -9 PID
    
  

That will kill only the specific PID number you give to the command.

Thanks for reading and happy computing!