Snap

Удалить:

sudo systemctl stop snapd.service
sudo systemctl disable snapd.service
sudo apt autoremove snapd
sudo dpkg --purge snapd
 
rm -rf ~/snap
sudo rm -rf /snap
sudo rm -rf /var/snap
sudo rm -rf /var/lib/snapd

Работа через proxy

snap set system proxy.http="http://<proxy_addr>:<proxy_port>"
snap set system proxy.https="http://<proxy_addr>:<proxy_port>"

https://snapcraft.io/docs/reference/administration/system-options/index.html#system-proxy-http-https-ftp

Очистка

snappurge.sh

#!/usr/bin/sh
 
#rm disabled packs
LANG=en_US.UTF-8 snap list --all | awk '/disabled/{print $1, $3}' |
  while read snapname revision; do
    snap remove "$snapname" --revision="$revision" --purge
  done
 
#rm cache
rm /var/lib/snapd/cache/*

sudo ./snappurge.sh

Показать сохранённые snapshot:

sudo snap saved

Удалить (забыть) snapshot с id 21:

 sudo snap forget 21

https://askubuntu.com/questions/1075050/how-to-remove-uninstalled-snaps-from-cache