I have the exact same issue. I cannot log out or shutdown my system by either
using GUI log out or through the terminal using "gnome-session-quit" (for log
out)
Error message: Failed to call logout:
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name
org.gnome.SessionManager was not
Public bug reported:
Error occurred during 18.04 upgrade to 18.04. Tried download after
reboot but failed;
ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: ttf-mscorefonts-installer 3.6ubuntu2
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
Sorry, meant 16.04 to 18.04 upgrade
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https://bugs.launchpad.net/bugs/1767748
Title:
package ttf-mscorefonts-installer 3.6ubuntu2 failed to
install/upgrade: installed ttf-mscorefonts-i
