I don't see it as a duplicate of bug #1813354, unless all upgrade bugs
are the same.
Anyway, key work-around was indeed here:
https://nelsonslog.wordpress.com/2020/02/21/upgrading-from-an-unsupported-ubuntu/
So my solution was like this:
- I started with 18.10
- Call do-release-upgrade
- Update /usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py
self.metarelease_information = open(self.METARELEASE_FILE, "r")
into
self.metarelease_information = open(self.METARELEASE_FILE + "2", "r")
It will be reverted by last step (real upgrade)
- Create /var/lib/update-manager/meta-release2, copy of meta-release
- In that file mark "disco" as supported
- Update /etc/apt/sources.list
all "cosmic" to "eoan"
- Call do-release-upgrade
There where some errors, but system "About" shows "19.10" after that
- Edit again /etc/apt/sources.list
all "eoan" become "focal"
- Call do-release-upgrade
real upgrade is happening, according to (long) time that it takes
Now the system is "20.04" and I see some graphical changes.
I suppose all is fine now.
This system is a physical machine, so I can't repeat all the process to
filter out unneeded steps.
** This bug is no longer a duplicate of bug 1813354
release-upgrader unable to deal with sources.list entries of "deb mirror://"
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https://bugs.launchpad.net/bugs/1892599
Title:
Attempt to upgrade from Ubuntu 18.10 (cosmic)
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