Comment 2 for bug 1887600

```
root@boxxy:~# apt remove --purge snapd
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following package was automatically installed and is no longer required:
  libllvm9
Use 'apt autoremove' to remove it.
The following packages will be REMOVED:
  snapd*
0 upgraded, 0 newly installed, 1 to remove and 6 not upgraded.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
Requesting to save current system state
Successfully saved as "autozsys_dqsrt5"
(Reading database ... 165648 files and directories currently installed.)
Purging configuration files for snapd (2.45.1+20.04) ...
Final directory cleanup
rm: cannot remove '/var/snap': Device or resource busy
dpkg: error processing package snapd (--purge):
 installed snapd package post-removal script subprocess returned error exit status 1
Errors were encountered while processing:
 snapd
```