Found and solved the issue.
/var/log/upstart/gdm.log.1.gz contained the log entries:
/proc/self/fd/9: 31: /etc/profile: [[: not found
/etc/profile ended with the invalid line:
[[ -f "/etc/autopackage/paths-bash" ]] && . "/etc/autopackage/paths-
bash"
I.e. it was caused by installing autopackage.
** Changed in: gdm (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1169640
Title:
GDM fails to start after system crash
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