Never had trouble in Qubes 4.0 is it possible to access the repositories from this testing version? Here is the result of the command:
user@debian-10-clone-1:~$ sudo apt-get update Hit:1 https://deb.qubes-os.org/r4.0/vm buster InRelease Get:2 https://cdn-aws.deb.debian.org/debian buster InRelease [122 kB] Get:3 https://cdn-aws.deb.debian.org/debian-security buster/updates InRelease [39.1 kB] Reading package lists... Done N: Repository 'https://cdn-aws.deb.debian.org/debian buster InRelease' changed its 'Version' value from '' to '10.1' E: Repository 'https://cdn-aws.deb.debian.org/debian buster InRelease' changed its 'Suite' value from 'testing' to 'stable' N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details. N: Repository 'https://cdn-aws.deb.debian.org/debian-security buster/updates InRelease' changed its 'Version' value from '' to '10' E: Repository 'https://cdn-aws.deb.debian.org/debian-security buster/updates InRelease' changed its 'Suite' value from 'testing' to 'stable' N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details. user@debian-10-clone-1:~$ -- You received this message because you are subscribed to the Google Groups "qubes-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to qubes-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/qubes-users/66f7ba71-f9f5-4b51-b41b-bd7e501d4868%40googlegroups.com.