The gnome-shell crash is bug 1964458 so I'll remove references to that
here.
Your log shows Xorg is failing to start on QXL with:
avril 05 16:15:58 ubuntu /usr/libexec/gdm-x-session[4265]: (EE) Screen(s)
found, but none have a usable configuration.
avril 05 16:15:58 ubuntu
** Summary changed:
- Jammy fails to boot to live session
+ Jammy fails to boot to live session in virt-manager with QXL
** Description changed:
Ubuntu Desktop Jammy 20220405
It fails to boot to the live session in virt-manager and gnome-boxes.
ubiquity-dm starts fine but the live
** Attachment added: "_usr_lib_xorg_Xorg.0.crash"
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1967901/+attachment/5577348/+files/_usr_lib_xorg_Xorg.0.crash
** Description changed:
Ubuntu Desktop Jammy 20220405
It fails to boot to the live session in virt-manager and
** Attachment added: "_usr_bin_gnome-shell.999.crash"
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1967901/+attachment/5577347/+files/_usr_bin_gnome-shell.999.crash
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** Attachment added: "journal.log"
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1967901/+attachment/5577346/+files/journal.log
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https://bugs.launchpad.net/bugs/1967901
** Attachment added: "debug"
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1967901/+attachment/5577344/+files/debug
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https://bugs.launchpad.net/bugs/1967901
Title:
Jammy
** Attachment added: "dm"
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1967901/+attachment/5577345/+files/dm
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https://bugs.launchpad.net/bugs/1967901
Title:
Jammy fails
