Workaround for broken qemu-system-gui upgrade in Hirsute until 5.1+dfsg-4ubuntu3 lands

[Christian Ehrhardt]

On Mon, Nov 30, 2020 at 4:31 PM Christian Ehrhardt
<christian.ehrhardt at canonical.com> wrote:
>
> Hi,
> if you are upgrading packages in hirsute as of today you might see a
> fail for the package qemu-system-gui. If you are not, be happy and
> feel free to close this mail :-)
>
> But if you are affected I first need to say sorry. Furthermore I
> wanted to let you know that it is some unfortunate fallout of the
> merge of qemu 5.1 which first triggered [2] for qemu-block-extra
> (already fixed) and now [3] qemu-system-gui (similar but different).
>
> Of course you can just wait for [1] to land in hirsute and upgrades
> will work again without you having to do any else. But if you just
> want to unblock your upgrades asap you should know that this issue is
> only on the upgrade path when running the .prerm of the currently
> installed version.
> Therefore here a few manual workarounds that you could consider:
>
> Workaround #1 - uninstall and install
> $ apt remove qemu-system-gui
> # the remove will complain the same way as the upgrade, but an install
> # of the new version over this state "rH" works.
> # You most likely had this installed through qemu-system-x86
> # so remember to re-install dependency removed packages as well:
> $ apt install qemu-system-x86 qemu-system-gui
>
> Workaround #2 - use repackaged 5.1+dfsg-4ubuntu1 (If you can't remove
> qemu* packages for some reason)
> # replace original 5.1+dfsg-4ubuntu1 with one that does not have the prerm issue
> $ wget https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1906245/+attachment/5439620/+files/qemu-system-gui_5.1+dfsg-4ubuntu1_amd64.repackaged.lp1906245.deb
> $ dpkg -i qemu-system-gui_5.1+dfsg-4ubuntu1_amd64.repackaged.lp1906245.deb
> # upgrade to 5.1+dfsg-4ubuntu2 (now working)
> $ apt install qemu-system-gui
>
> Workaround #3 - use the PPA version
> $ sudo add-apt-repository ppa:ci-train-ppa-service/4356
> $ apt install qemu-system-gui
> # or
> $ apt install upgrade
> # This will need libgdk-pixbuf-2.0-0 from proposed thou

And if 3 isn't a charm for you, you can as well remove the bad lines
from the old prerm and then upgrade:
Workaround #4
$ sed -i -e '/Debian 1:5.1+dfsg-4ubuntu1/d'
/var/lib/dpkg/info/qemu-system-gui*.prerm
$ apt install qemu-system-gui


> [1]: https://launchpad.net/ubuntu/+source/qemu/1:5.1+dfsg-4ubuntu3
> [2]: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1905377
> [3]: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1906245
>
> --
> Christian Ehrhardt
> Staff Engineer, Ubuntu Server
> Canonical Ltd



-- 
Christian Ehrhardt
Staff Engineer, Ubuntu Server
Canonical Ltd