$ apt-get source qemu
Reading package lists... Done
E: Unable to find a source package for qemu

Problem was actually that there were multiple deb-src lines in /etc/apt/sources.list and it didn't know which to choose.

Solution: add `-t unstable` to the command to choose the latest version.

6.1 from to

apt source -t unstable qemu
cd qemu-6.1+dfsg
sudo apt build-dep -t bullseye qemu
sudo apt install python3-sphinx-rtd-theme libfuse3-dev
debuild -i -us -uc -b

IMPORTANT: small patch needed in `debian/rules` to ignore an error that occurs with PipeWire/JACK stuff:

- dh_shlibdeps -a
+ dh_shlibdeps -a -- --ignore-missing-info

Otherwise it'll fail near the end of the build. Rebuilding starts again from scratch so you'll have to wait all over.

Wait ~15mins (using a 16-thread desktop processor).

Install the resulting QEMU debs with `sudo dpkg -i`: eg

apt search qemu |
grep ^qemu.*installed |
sed "s|/.*|_6.1+dfsg-5_*.deb|" |
xargs echo sudo dpkg -i
then copy-and-paste the output into the shell.

I had to `sudo apt remove libvirt0` to avoid dependency issues before installing the fresh QEMU debs.

Hope it fixes my sound issues...


WIth QEMU 6.1 I have a different experience to QEMU 5: the sound bridge between QEMU and host works much better in 6.1, but I get xruns inside the VM.

The OS in the VM works fine on real hardware (testing with a netbook with Atom processor and 1GB RAM) with only occasional xruns....

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