I recently encountered an issue on my Ubuntu 24.04 system where the update-notifier application crashed with the following error:
Sorry, Ubuntu 24.04 has experienced an internal error.
ExecutablePath: /usr/bin/update-notifier
Package: update-notifier 3.192.68build3
ProblemType: Crash
Title: update-notifier crashed with SIGSEGV in g_hash_table_lookup()
It does look like you’re on the latest version of update-notifier. So there may not be an update right now that fixes this issue. As a result this may happen again, now and then. Do keep an eye on that bug report, as there may be updates later, if more people are affected.