Thank you for your help, paride. Now, answering your questions:
Yes, I am using last versions of Packer (1.8.0) and VirtualBox (6.1.32). Host is Windows 10. Ubuntu 20.04 works, but .1, .2, .3 and .4 update releases don't. By the way, the situation is worse in jammy daily builds because I can not even begin the unattended instalation (I have opened a question about this problem in Ubuntu forums https://ubuntuforums.org/showthread.php?t=2472899).
ens33 is in user-data file just because I copied a working example of autoinstall file.
I can ssh login from the machine to itself.
I have made some screenshots showing the output of commands you asked me for.
Thank you for your help, paride. Now, answering your questions:
Yes, I am using last versions of Packer (1.8.0) and VirtualBox (6.1.32). Host is Windows 10. Ubuntu 20.04 works, but .1, .2, .3 and .4 update releases don't. By the way, the situation is worse in jammy daily builds because I can not even begin the unattended instalation (I have opened a question about this problem in Ubuntu forums https:/ /ubuntuforums. org/showthread. php?t=2472899).
ens33 is in user-data file just because I copied a working example of autoinstall file.
I can ssh login from the machine to itself.
I have made some screenshots showing the output of commands you asked me for.