$ sudo apt-get update
Get:1 http://ftp.debian.org/debian buster-backports InRelease [46.7 kB]
Hit:2 https://contrib.qubes-os.org/deb/r4.0/vm buster InRelease
Hit:3 https://deb.qubes-os.org/r4.0/vm buster InRelease
Hit:4 https://deb.debian.org/debian buster InRelease
Get:5 https://deb.debian.org/debian-security buster/updates InRelease [65.4 kB]
Err:2 https://contrib.qubes-os.org/deb/r4.0/vm buster InRelease
The following signatures were invalid: EXPKEYSIG A8F7A1DC99F29DAA Qubes OS Contrib Release 4 Signing Key
Fetched 112 kB in 1s (134 kB/s)
Reading package lists… Done
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://contrib.qubes-os.org/deb/r4.0/vm buster InRelease: The following signatures were invalid: EXPKEYSIG A8F7A1DC99F29DAA Qubes OS Contrib Release 4 Signing Key
W: Failed to fetch https://contrib.qubes-os.org/deb/r4.0/vm/dists/buster/InRelease The following signatures were invalid: EXPKEYSIG A8F7A1DC99F29DAA Qubes OS Contrib Release 4 Signing Key
W: Some index files failed to download. They have been ignored, or old ones used instead.
Does anybody have the same problem with updating of the Debian 10 version?