Comment 27 for bug 2008212

Verification for jammy:
As mentioned in the bug description, this bug happens on focal and earlier.
On Jammt, apt already has the phasing implemented, and update-notifier will not fail even with the bug being present.

apt show apt 2>&1 | grep Phase
# nothing faked yet

/usr/lib/update-notifier/apt-check -p 2>&1 | grep apt
apt
libapt-pkg6.0
apt-utils

(Faking phasing on -proposed apt package)

apt show apt 2>&1 | grep Phase
Phased-Update-Percentage: 0

# Currently installed version:
apt-cache policy update-notifier-common | head -n 3
update-notifier-common:
  Installed: 3.192.54.5
  Candidate: 3.192.54.6

/usr/lib/update-notifier/apt-check -p 2>&1 | grep apt
libapt-pkg6.0

# after upgrade to -proposed:
apt-cache policy update-notifier-common | head -n 3
update-notifier-common:
  Installed: 3.192.54.6
  Candidate: 3.192.54.6

/usr/lib/update-notifier/apt-check -p 2>&1 | grep apt
libapt-pkg6.0
#

# same behavior, was respecting the phasing even before.