[ahmad ~]$ ls /usr/lib/x86_64-linux-gnu/libfm-qt.so.12                                                                                                                    
/usr/lib/x86_64-linux-gnu/libfm-qt.so.12                                                                                                                                  
[ahmad ~]$

apt install base-files/unstable

[ahmad ~]$ cat /etc/os-release 
PRETTY_NAME="Devuan GNU/Linux 5 (daedalus/ceres)"
NAME="Devuan GNU/Linux"
VERSION_ID="5"
VERSION="5 (daedalus/ceres)"
VERSION_CODENAME="daedalus ceres"
ID=devuan
ID_LIKE=debian
HOME_URL="https://www.devuan.org/"
SUPPORT_URL="https://devuan.org/os/community"
BUG_REPORT_URL="https://bugs.devuan.org/"
[ahmad ~]$ 

[ahmad ~]$ sudo apt install --reinstall base-files
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Reinstallation of base-files is not possible, it cannot be downloaded.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
[ahmad ~]$ 

Package: base-files
Version: 12.3
Status: install ok installed
Priority: required
Essential: yes
Section: admin
Maintainer: Santiago Vila <sanvila@debian.org>
Installed-Size: 349 kB
Provides: base
Pre-Depends: awk

[ahmad@devuan ~]$ apt search policykit-1-gnome                                                                                                                     
Sorting... Done                                                                                                                                                    
Full Text Search... Done                                                                                                                                           
policykit-1-gnome/testing,now 0.105-7 amd64 [installed]                                                                                                            
  authentication agent for PolicyKit                                                                                                                               
                                                                                                                                                                   
[ahmad@devuan ~]$

[ahmad@devuan s2]$ apt policy elogind
elogind:
  Installed: 246.10-2
  Candidate: 246.10-2
  Version table:
 *** 246.10-2 500
        500 http://deb.devuan.org/merged testing/main amd64 Packages
        100 /var/lib/dpkg/status

EnableWallMessages=no
KillUserProcesses=no
RebootToFirmwareSetup=no
RebootToBootLoaderMenu=18446744073709551615
IdleHint=yes
IdleSinceHint=1626599384450429
IdleSinceHintMonotonic=2793292978
BlockInhibited=handle-power-key:handle-suspend-key:handle-hibernate-key
DelayInhibited=sleep
InhibitDelayMaxUSec=5s
UserStopDelayUSec=0
HandlePowerKey=poweroff
HandleSuspendKey=suspend
HandleHibernateKey=hibernate
HandleLidSwitch=suspend
HandleLidSwitchDocked=ignore
HoldoffTimeoutUSec=30s
IdleAction=ignore
IdleActionUSec=30min
PreparingForShutdown=no
PreparingForSleep=no
Docked=no
LidClosed=no
OnExternalPower=yes
RemoveIPC=no
RuntimeDirectorySize=401960960
RuntimeDirectoryInodesMax=98135
InhibitorsMax=8192
NCurrentInhibitors=6
SessionsMax=8192
NCurrentSessions=1

[ahmad@devuan ~]$ gnome-session --session=wayland

** (process:2078): WARNING **: 06:38:32.204: Could not make bus activated clients aware of XDG_CURRENT_DESKTOP=GNOME environment variable: Could not connect: Connection refused
gnome-session-binary[2078]: WARNING: Failed to upload environment to DBus: Could not connect: Connection refused
gnome-session-binary[2078]: WARNING: Failed to upload environment to systemd: Could not connect: Connection refused
gnome-session-binary[2078]: WARNING: Could not make bus activated clients aware of GNOME_DESKTOP_SESSION_ID=this-is-deprecated environment variable: Could not connect: Connection refused
gnome-session-binary[2078]: WARNING: Could not make bus activated clients aware of XDG_MENU_PREFIX=gnome- environment variable: Could not connect: Connection refused
gnome-session-binary[2078]: WARNING: Could not get session id for session. Check that logind is properly installed and pam_systemd is getting used at login.
Gnome-session-binary[2078]: WARNING: Lost name on bus: org.gnome.SessionManager
Unable to init server: Could not connect: Connection refused

** (gnome-session-failed:2085): WARNING **: 06:38:32.223: Cannot open display:
Terminated