Ubuntu Desktop 2023 VMs slow

Hello.

I see an odd behavior with Ubuntu Desktop VMs: version 23.10 and 23.04 start well after creation, but quickly they become unusable, like frozen. With release 22.04, all is ok: once started, the VM container displays the initial setup window (connect with an account, localization, etc) and can be used. With 23.04 and 23.10 I cannot used them.

I start all these VMs the same way:

lxc launch images:$IMG ubuntu --vm -c security.secureboot=false -c limits.cpu=4 -c limits.memory=4GiB --console=vga

$IMG being resp. ubuntu/22.04/desktop, ubuntu/23.04/desktop and ubuntu/23.10/desktop

My lxd version is 5.19, client and server. Images ids are the following, refreshed yesterday:

| u-2204 | e54f4ad921ee | no | Ubuntu jammy amd64 (20231025_07:42) | x86_64 | VIRTUAL-MACHINE | 961.54MiB | Oct 25, 2023 at 5:19pm (UTC) |
| u-2304 | ce11fb469512 | no | Ubuntu lunar amd64 (20231025_07:42) | x86_64 | VIRTUAL-MACHINE | 1111.53MiB | Oct 25, 2023 at 1:44pm (UTC) |
| u-2310 | 8dac65b1dec1 | no | Ubuntu mantic amd64 (20231025_07:42) | x86_64 | VIRTUAL-MACHINE | 1076.33MiB | Oct 25, 2023 at 1:57pm (UTC) |

Anyone observing the same issue or having a suggestion on what to do?

Guy