For sake of confirmation, I tried again and yes: it takes a long time without any messages but it completes the installation.
2024-04-23 11:16:14,281 DEBUG root:38 start: subiquity/Install/install/postinstall/run_unattended_upgrades/cmd-in-targe> 2024-04-23 11:53:53,037 DEBUG root:38 finish: subiquity/Install/install/postinstall/run_unattended_upgrades/cmd-in-targ>
It took 37 minutes to complete unattended-upgrades, but it made it :)
For sake of confirmation, I tried again and yes: it takes a long time without any messages but it completes the installation.
2024-04-23 11:16:14,281 DEBUG root:38 start: subiquity/ Install/ install/ postinstall/ run_unattended_ upgrades/ cmd-in- targe> Install/ install/ postinstall/ run_unattended_ upgrades/ cmd-in- targ>
2024-04-23 11:53:53,037 DEBUG root:38 finish: subiquity/
It took 37 minutes to complete unattended- upgrades, but it made it :)