This bug was fixed in the package update-notifier - 3.192.1
---------------
update-notifier (3.192.1) bionic; urgency=medium
* Use a wrapper script of /bin/sh when calling check-new-release-gtk to
workaround its requirement that the ppid not be 1. (LP: #1768748)
-- Brian Murray <[email protected]> Fri, 04 May 2018 15:42:00 -0700
** Changed in: update-notifier (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1768748
Title:
17.10 to 18.04 upgrade: 'upgrade now' has no effect
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