Marc:

Are you using gdm to log into the graphical session?

lightdm - this is Xubuntu

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https://bugs.launchpad.net/bugs/1784964

Title:
  Regression due to CVE-2018-1116 (processes not inheriting user's
  groups )

Status in policykit-1 package in Ubuntu:
  Confirmed

Bug description:
  This report is tracking a possible regression caused by the recent
  CVE-2018-1116 patches to policykit-1.

  On 18.04, since package upgrades on July 23rd, and after the first
  reboot since then on Aug 1st, I hit an issue with the primary (sudo,
  adm, etc...) user getting Permission Denied trying to do:

  tail -f /var/log/syslog

  when that file is owned by syslog:adm and is g=r.

  I then found that "groups" reports only the $USER and not the entire
  list, but "groups $USER" reports all the groups correctly.

  The user shell is set to /usr/bin/tmux and /etc/tmux.conf has "set -g
  default-shell /bin/bash"

  After changing the user's shell back to /bin/bash and logging in on
  tty1 the list of groups shows correctly for the /bin/bash process
  running on tty1.

  I investigated and found that for the affected processes, such as the
  tmux process, /proc/$PID/loginuid = 4294967295  whereas the /bin/bash
  process on tty1 correctly reported 1000. The same with the respective
  gid_map and uid_map.

  4294967295 == -1 == 0xFFFFFFFF

  The recent CVE patch to policykit has several functions where it does
  "uid = -1" which seems to tie in to my findings so far.

  I also noticed Ubuntu is still based on version 0.105 which was
  released in 2012 - upstream released 0.115 with the CVE patch.

  I suspect the backporting has missed something.

  The Ubuntu backport patch is:

  https://git.launchpad.net/ubuntu/+source/policykit-1/commit/?h=applied/ubuntu
  /bionic-devel&id=840c50182f5ab1ba28c1d20cce4c207364852935

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