For the record this works fine for me.
bdmurray@clean-focal-amd64:~$ /usr/lib/update-notifier/apt-check
--human-readable
34 updates can be applied immediately.
13 of these updates are standard security updates.
To see these additional updates run: apt list --upgradable
bdmurray@clean-focal-amd64:~$ apt-cache policy distro-info
distro-info:
Installed: 0.23ubuntu1
Candidate: 0.23ubuntu1
Version table:
*** 0.23ubuntu1 500
500 http://192.168.10.7/ubuntu focal/main amd64 Packages
100 /var/lib/dpkg/status
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https://bugs.launchpad.net/bugs/1943638
Title:
apt_check.py crashes with exception "AttributeError"
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