Я, честно говоря, не понимаю, что происходит. Я только что обновил пакеты через веб-интерфейс. Обновление прошло нормально, я перезагрузился и ещё раз проверил наличие обновлений, чтобы убедиться. Такого раньше не было. Что я делаю не так?

Код:
Starting system upgrade: apt-get dist-upgrade
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
 libunbound8
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.

System not fully up to date (found 1 new packages)

starting shell
root@pve-server:/# cat /etc/apt/sources.list
deb http://ftp.us.debian.org/debian bookworm main contrib

deb http://ftp.us.debian.org/debian bookworm-updates main contrib

# security updates
deb http://security.debian.org bookworm-security main contrib

deb http://download.proxmox.com/debian/pve bookworm pve-no-subscription

deb http://ppa.launchpad.net/savoury1/ffmpeg4/ubuntu focal main
root@pve-server:/# cat /etc/apt/sources.list.d/
cat: /etc/apt/sources.list.d/: Is a directory
root@pve-server:/# cat /etc/apt/sources.list.d/
ceph.list            pve-enterprise.list
root@pve-server:/# cat /etc/apt/sources.list.d/pve-enterprise.list
# deb https://enterprise.proxmox.com/debian/pve bookworm pve-enterprise

root@pve-server:/# cat /etc/apt/sources.list.d/ceph.list          
# deb https://enterprise.proxmox.com/debian/ceph-quincy bookworm enterprise

root@pve-server:/# apt-get update
Hit:1 http://ftp.us.debian.org/debian bookworm InRelease
Hit:2 http://security.debian.org bookworm-security InRelease                                                                                      
Hit:3 http://ftp.us.debian.org/debian bookworm-updates InRelease                                                                                  
Hit:4 http://ppa.launchpad.net/savoury1/ffmpeg4/ubuntu focal InRelease            
Hit:5 http://download.proxmox.com/debian/pve bookworm InRelease
Reading package lists... Done        
W: http://ppa.launchpad.net/savoury1/ffmpeg4/ubuntu/dists/focal/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
root@pve-server:/# apt-get upgrade
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
 libunbound8
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.