I swear I did a search to see if this was already raised but failed to
find anything. However, I just found an older ticket:
https://bugs.launchpad.net/ubuntu/+source/icingaweb2/+bug/1769890. This
can be closed as a dupe. Sorry.
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Public bug reported:
I just upgraded a machine to Ubuntu Bionic. I was using icingaweb2 to monitor
a server before the upgrade.
After the upgrade when I try to login to icinga2 I get an error:
Fatal error: Uncaught ErrorException: session_name(): Cannot change session
name when session is a