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I'm on (L)Ubuntu 16.04.2 LTS. I've installed Texlive 2107 and removed TL16. When I log in I receive the error: No session for pid xxxx.

Moreover I don't see the network icon on the bottom-right and I cannot connect to internet. I can't also see the shutdown button if I try to shutdown.

Edit: if I try to access the network I receive: error accessing system permissions: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.PolicyKit1 was not provided by any service files. I receive this problem in many other situations

Edit1: it's seems a problem of Polkit agent

Edit2:

When I log in I received No session for pid 1119.

ps 1119
PID  TTY STAT TIME COMMAND
1119 ?   Ssl  0:00 /usr/bin/lxsession -s Lubuntu -e LXDE

If I go to "Preferences" -> "Default applications for LXsession" -> "Core applications" and press "Reload" for lxpolkit as the polkit agent, I get No session for pid 1370.

ps 1370
PID  TTY STAT TIME COMMAND
1370 ?   S  0:00   lxpolkit 

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