Finally found what changed. I updated /etc/fstab to have /proc mounted
with hidepid=2,gid=sudo for added security. This works perfectly on
16.04 but totally breaks on 17.10.

To recap: mounting /proc with "nodev,noexec,nosuid" works but adding
"hidepid=2,gid=sudo" breaks.

** Tags added: regression

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https://bugs.launchpad.net/bugs/1754401

Title:
  mounting /proc with hidepid causes: Fatal server error: (EE)
  xf86OpenConsole: Cannot open virtual console 1 (Permission denied)

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