Could you please be more specific about your problem?
The below terminal output got from Ubuntu MATE 21.10:
$ head -n1 /etc/apt/sources.list
#deb cdrom:[Ubuntu-MATE 21.10 _Impish Indri_ - Release amd64 (20211012)]/ impish main multiverse restricted universe
$ snap list
Name Version Rev Tracking Publisher Notes
core18 20211015 2246 latest/stable canonical✓ base
gtk-theme-yaru-mate 21.04.6 6 latest/stable/… flexiondotorg -
icon-theme-yaru-mate 21.04.6 1 latest/stable/… flexiondotorg -
snapd 2.52.1 13640 latest/stable canonical✓ snapd
software-boutique 0+git.f633ffb 54 latest/stable/… flexiondotorg classic
ubuntu-mate-welcome 21.10.0-5b832ea8 646 latest/stable/… flexiondotorg classic
I do not see cups and pulseaudio here.