This is just a quick confirmation that the direct method of changing repos works relatively well. I did
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# sed -i 's/xenial/bionic/g ; s/sylvia/tara/g' /etc/apt/sources.list.d/official-package-repositories.list
# apt-get update
# apt-get upgrade
# apt-get dist-upgrade
with just a few relatively minor hiccups that are all referenced on these forums:
(1) During the apt-get upgrade phase I ran into this
dbus-x11 error, fixable as suggested there:
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# dpkg --configure -a
# apt-get install -f
(2) After the upgrade I would get
cgmanager failures; again fixable as in the linked thread, by
(3) Finally, all kernels newer than 4.10.0-38 would fail to load a graphical session for my NIS user with systemd-logind errors. This is documented in
this other thread.
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I don't know that I would have gotten off scot free from any of these following the official upgrade path. There's some indication in the
follow-up discussion to the upgrade blog post that in some cases the dbus-x11 error was self-resolving though.
In any case, this is just an attempt to document all of the issues in one particular upgrade instance, in case it offers some reassurance.