I tested a release upgrade from bionic to cosmic with the versions of
update-manager and ubuntu-release-upgrader from -proposed and my third
party mirror enabled - during the upgrade I did not receive the "No
valid mirror" found error message and my sources.list was just rewritten
from bionic to cosmic. Additionally, we can see the new line in /var/log
/dist-upgrade/main.log:
bdmurray@clean-bionic-amd64:~$ apt-cache policy ubuntu-release-upgrader-core
ubuntu-release-upgrader-core:
Installed: 1:18.04.30
Candidate: 1:18.04.30
Version table:
*** 1:18.04.30 100
100 /var/lib/dpkg/status
1:18.04.29 500
500 http://192.168.10.7/ubuntu bionic-updates/main amd64 Packages
500 http://192.168.10.7/ubuntu bionic-updates/main i386 Packages
1:18.04.17 500
500 http://192.168.10.7/ubuntu bionic/main amd64 Packages
500 http://192.168.10.7/ubuntu bionic/main i386 Packages
bdmurray@clean-bionic-amd64:~$ grep "overriden" /var/log/dist-upgrade/main.log
2019-01-23 06:27:37,048 WARNING mirror check skipped, *overriden* via config
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https://bugs.launchpad.net/bugs/1807032
Title:
RELEASE_UPGRADER_ALLOW_THIRD_PARTY env variable not passed to dist-
upgrader tarball
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