Bug#992592: lightdm fails to start after update to bullseye (missing '/var/lib/lightdm/data')

[наб <nabijaczleweli@nabijaczleweli.xyz>]

Hi!

A friend just hit this on a fresh lightdm install on current sid;
she did apt install lightdm; dpkg-reconfigure lightdm,
and on restart she kept getting
  Could not enumerate user data directory /var/lib/lightdm/data: Error opening directory '/var/lib/lightdm/data': No such file or directory
from lightdm in the journal.

Inexplicably, repeating the steps from the postinst:
  mkdir -p /var/lib/lightdm
  chown lightdm:lightdm /var/lib/lightdm
  chmod 0750 /var/lib/lightdm
/and then/
  sudo -u lightdm mkdir /var/lib/lightdm/data
made lightdm go on until an unrelated X.org error killed it.

Adding just the latter to the presumably-run-by-the-postinst
bit may've worked as well, but we were hardly in a clinical
environment.

Best,
наб

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