The following only applies to already existing ASCII systems that got 
upgraded to the newest package versions as present in the repositories. 
Fresh installations of Devuan ASCII 2.0.0 Beta should not be affected.

Make sure you got the correct libpolkit-backend installed!

  It would appear that under certain circumstances an unsuitable flavor 
of libpolkit-backend-1-0-XXXX gets pulled in upon upgrade. This can lead 
to a temporary loss of desktop session related functionality, namely the 
ability to user-mount removable drives or to shutdown/restart the system 
using the GUI controls provided by the respective desktop environment. The 
issue was ultimately caused by the recent addition of elogind to the 
repositories, or rather the repackaging of policykit-1 that followed suit.

1. Make sure you have at least one of (traditional) consolekit or (new)
   elogind installed. (Note: You can have both installed and active; which 
   one is actually used however is decided by which libpolkit-backend you 
   choose to install, see 4.)

2. Make sure (at least one of) the above is activated. You may do so by
   interactively running the 'pam-auth-update' command as root.

3. Ensure the following packages got installed:
     policykit-1              0.105-18+devuan2.4
     libpolkit-agent-1-0      0.105-18+devuan2.4
4. Install one of the mutually exclusive policykit backend libs, i.e.
   - EITHER -
     libpolkit-backend-1-0-elogind      0.105-18+devuan2.4  and
     libpolkit-gobject-1-0-elogind      0.105-18+devuan2.4

   - OR -
     libpolkit-backend-1-0-consolekit   0.105-18+devuan2.4  and
     libpolkit-gobject-1-0-consolekit   0.105-18+devuan2.4

   depending on which session manager backend you intend to use, see 1.

   In case you find you have a backend with -systemd in the name installed:
   that one will _not_ work, and is most likely the cause why things went 
   sideways in the first place.

5. After making changes to the session management you should either reboot 
   the system or at least cycle through runlevel 1.

Note:  Depending on what login manager you use in conjunction with which 
desktop environment you might have to experiment a bit to find out which 
of consolekit or elogind works best for you (or works[TM] at all).

Bottom line: As always in life, keep your backends covered. ;-)

HTH, HANVD, and enjoy the ASCII Beta!

Best regards

Sapere aude!
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