The code managing this situation actually has the information about the
PIDs of the running processes.
Samuele, do you think we should print them as part of the error message?
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PS I will leave this open because the tooling/docs/error messages when
this happens could be more helpful. I had to go and read snapd source
code to find out how it even determines that a snap is running.
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Bugs, which is
Okay I found the problem - a detached tmux session was still running
inside the container.
The way you actually find this is to run `systemctl-cgls` and then look
for the cgroup belonging to the snap. It will be something like
`snap.clion.clion.e566369e-6a51-4497-84ba-d4f52f65291b.scope` and the
