Login not working in Backup mode with LightDM

[nerun]

Tested with:

• Remastersys 4.3 and 4.4
• Linux Mint 21.1 Cinnamon
• LightDM display manager (default manager in Cinnamon)

Login is not working in backup mode when using LightDM display manager. But does work with Gnome's gdm3 (not tested with KDE). I don't know why but, since version 4.4 fixed a similar issue with Dist mode there should be some relation.

Related to Issue #5 (closed).

ADDENDUM 1:

• gdm3 login works in backup mode, BUT home folder doesn't load.
• Need to test with DEBIAN 11.6, because Linux Mint IS NOT DEBIAN.

ADDENDUM 2:

• package 4.4-1 created in Linux Mint can not be installed on DEBIAN: unknown compression for element control.tar.zst.

ADDENDUM 3: package 4.4-2 created in Debian 11.6. It is now installable on Debian.

• Tested LightDM in backup mode: doesn't login.
• Tested gdm3 in backup mode: login works, BUT home folder doesn't load, impossible to open nautilus.
• Tested gdm3 in dist mode: everything works without issues.

[nerun]

Partial Fix

• Release 4.4-2: fixed issue unknown compression for element control.tar.zst. Not installable on Debian and some derived distros.
• a3b4644ad51eb538295a333babe44e32e380eff8: home folder is not copied in backup mode.

  Not fixed yet

• LightDM doesn't login in backup mode.

[nerun]

Fixed

• f732fe37fc0ff7b38bcf4686bb0a275c35c89054: fixed LightDM doesn't login in backup mode.