adam@adam-desktop:~$ apt-cache policy | grep http | awk '{print $2 $3}' | sort -u
http://ports.ubuntu.com/ubuntu-portsfocal-security/main
http://ports.ubuntu.com/ubuntu-portsfocal-security/restricted
http://ports.ubuntu.com/ubuntu-portsfocal-security/universe
http://ppa.launchpad.net/lah7/ubuntu-mate-colours/ubuntufocal/main
http://ppa.launchpad.net/ubuntu-pi-flavour-makers/ppa/ubuntufocal/main
http://ppa.launchpad.net/yktooo/ppa/ubuntufocal/main
adam@adam-desktop:~$ ls /etc/apt/sources.list.d | egrep -v "(^#.*|^$)"
lah7-ubuntu-ubuntu-mate-colours-focal.list
lah7-ubuntu-ubuntu-mate-colours-focal.list.save
ubuntu-pi-flavour-makers-ubuntu-ppa-focal.list
ubuntu-pi-flavour-makers-ubuntu-ppa-focal.list.save
yktooo-ubuntu-ppa-focal.list
yktooo-ubuntu-ppa-focal.list.save
adam@adam-desktop:~$ sudo apt update
[sudo] password for adam:
Hit:1 http://ppa.launchpad.net/lah7/ubuntu-mate-colours/ubuntu focal InRelease
Get:2 http://gb.archive.ubuntu.com/ubuntu focal-updates InRelease [111 kB]
Get:3 http://ports.ubuntu.com/ubuntu-ports focal-security InRelease [107 kB]
Get:4 http://gb.archive.ubuntu.com/ubuntu focal InRelease [265 kB]
Hit:5 http://ppa.launchpad.net/ubuntu-pi-flavour-makers/ppa/ubuntu focal InRelease
Ign:6 http://gb.archive.ubuntu.com/ubuntu focal-updates/main arm64 Packages
Get:7 http://gb.archive.ubuntu.com/ubuntu focal-updates/main i386 Packages [191 kB]
Get:7 http://gb.archive.ubuntu.com/ubuntu focal-updates/main i386 Packages [191 kB]
Get:7 http://gb.archive.ubuntu.com/ubuntu focal-updates/main i386 Packages [191 kB]
Get:7 http://gb.archive.ubuntu.com/ubuntu focal-updates/main i386 Packages [191 kB]
Get:7 http://gb.archive.ubuntu.com/ubuntu focal-updates/main i386 Packages [191 kB]
Get:7 http://gb.archive.ubuntu.com/ubuntu focal-updates/main i386 Packages [191 kB]
Get:7 http://gb.archive.ubuntu.com/ubuntu focal-updates/main i386 Packages [191 kB]
Get:7 http://gb.archive.ubuntu.com/ubuntu focal-updates/main i386 Packages [191 kB]
Get:7 http://gb.archive.ubuntu.com/ubuntu focal-updates/main i386 Packages [191 kB]
Get:7 http://gb.archive.ubuntu.com/ubuntu focal-updates/main i386 Packages [191 kB]
Get:7 http://gb.archive.ubuntu.com/ubuntu focal-updates/main i386 Packages [191 kB]
Ign:18 http://gb.archive.ubuntu.com/ubuntu focal-updates/restricted arm64 Packages
Ign:19 http://gb.archive.ubuntu.com/ubuntu focal-updates/universe arm64 Packages
Get:20 http://gb.archive.ubuntu.com/ubuntu focal-updates/universe i386 Packages [82.9 kB]
Ign:21 http://gb.archive.ubuntu.com/ubuntu focal-updates/multiverse arm64 Packages
Ign:6 http://gb.archive.ubuntu.com/ubuntu focal-updates/main arm64 Packages
Ign:18 http://gb.archive.ubuntu.com/ubuntu focal-updates/restricted arm64 Packages
Ign:19 http://gb.archive.ubuntu.com/ubuntu focal-updates/universe arm64 Packages
Ign:21 http://gb.archive.ubuntu.com/ubuntu focal-updates/multiverse arm64 Packages
Ign:6 http://gb.archive.ubuntu.com/ubuntu focal-updates/main arm64 Packages
Ign:18 http://gb.archive.ubuntu.com/ubuntu focal-updates/restricted arm64 Packages
Ign:19 http://gb.archive.ubuntu.com/ubuntu focal-updates/universe arm64 Packages
Get:21 http://gb.archive.ubuntu.com/ubuntu focal-updates/multiverse arm64 Packages [2,306 B]
Get:21 http://gb.archive.ubuntu.com/ubuntu focal-updates/multiverse arm64 Packages [2,306 B]
Get:21 http://gb.archive.ubuntu.com/ubuntu focal-updates/multiverse arm64 Packages [2,306 B]
Get:21 http://gb.archive.ubuntu.com/ubuntu focal-updates/multiverse arm64 Packages [2,306 B]
Get:21 http://gb.archive.ubuntu.com/ubuntu focal-updates/multiverse arm64 Packages [2,306 B]
Get:21 http://gb.archive.ubuntu.com/ubuntu focal-updates/multiverse arm64 Packages [2,306 B]
Get:21 http://gb.archive.ubuntu.com/ubuntu focal-updates/multiverse arm64 Packages [2,306 B]
Get:21 http://gb.archive.ubuntu.com/ubuntu focal-updates/multiverse arm64 Packages [2,306 B]
Ign:21 http://gb.archive.ubuntu.com/ubuntu focal-updates/multiverse arm64 Packages
Get:6 http://gb.archive.ubuntu.com/ubuntu focal-updates/main arm64 Packages [368 kB]
Get:6 http://gb.archive.ubuntu.com/ubuntu focal-updates/main arm64 Packages [368 kB]
Get:6 http://gb.archive.ubuntu.com/ubuntu focal-updates/main arm64 Packages [368 kB]
Get:6 http://gb.archive.ubuntu.com/ubuntu focal-updates/main arm64 Packages [368 kB]
Get:6 http://gb.archive.ubuntu.com/ubuntu focal-updates/main arm64 Packages [368 kB]
Get:6 http://gb.archive.ubuntu.com/ubuntu focal-updates/main arm64 Packages [368 kB]
Get:6 http://gb.archive.ubuntu.com/ubuntu focal-updates/main arm64 Packages [368 kB]
Get:6 http://gb.archive.ubuntu.com/ubuntu focal-updates/main arm64 Packages [368 kB]
Ign:6 http://gb.archive.ubuntu.com/ubuntu focal-updates/main arm64 Packages
Ign:38 http://gb.archive.ubuntu.com/ubuntu focal/main arm64 Packages
Ign:39 http://gb.archive.ubuntu.com/ubuntu focal/restricted arm64 Packages
Ign:40 http://gb.archive.ubuntu.com/ubuntu focal/universe arm64 Packages
Ign:41 http://gb.archive.ubuntu.com/ubuntu focal/multiverse arm64 Packages
Ign:18 http://gb.archive.ubuntu.com/ubuntu focal-updates/restricted arm64 Packages
Ign:19 http://gb.archive.ubuntu.com/ubuntu focal-updates/universe arm64 Packages
Ign:21 http://gb.archive.ubuntu.com/ubuntu focal-updates/multiverse arm64 Packages
Ign:6 http://gb.archive.ubuntu.com/ubuntu focal-updates/main arm64 Packages
Ign:38 http://gb.archive.ubuntu.com/ubuntu focal/main arm64 Packages
Get:42 http://ports.ubuntu.com/ubuntu-ports focal-security/main arm64 Packages [125 kB]
Get:43 http://ports.ubuntu.com/ubuntu-ports focal-security/main i386 Packages [59.5 kB]
Get:43 http://ports.ubuntu.com/ubuntu-ports focal-security/main i386 Packages [59.5 kB]
Get:43 http://ports.ubuntu.com/ubuntu-ports focal-security/main i386 Packages [59.5 kB]
Ign:39 http://gb.archive.ubuntu.com/ubuntu focal/restricted arm64 Packages
Ign:40 http://gb.archive.ubuntu.com/ubuntu focal/universe arm64 Packages
Ign:41 http://gb.archive.ubuntu.com/ubuntu focal/multiverse arm64 Packages
Ign:18 http://gb.archive.ubuntu.com/ubuntu focal-updates/restricted arm64 Packages
Ign:19 http://gb.archive.ubuntu.com/ubuntu focal-updates/universe arm64 Packages
Ign:43 http://ports.ubuntu.com/ubuntu-ports focal-security/main i386 Packages
Ign:47 http://ports.ubuntu.com/ubuntu-ports focal-security/restricted i386 Packages
Ign:48 http://ports.ubuntu.com/ubuntu-ports focal-security/universe i386 Packages
Ign:21 http://gb.archive.ubuntu.com/ubuntu focal-updates/multiverse arm64 Packages
Err:6 http://gb.archive.ubuntu.com/ubuntu focal-updates/main arm64 Packages
  404  Not Found [IP: 91.189.88.152 80]
Ign:38 http://gb.archive.ubuntu.com/ubuntu focal/main arm64 Packages
Ign:39 http://gb.archive.ubuntu.com/ubuntu focal/restricted arm64 Packages
Ign:40 http://gb.archive.ubuntu.com/ubuntu focal/universe arm64 Packages
Ign:41 http://gb.archive.ubuntu.com/ubuntu focal/multiverse arm64 Packages
Ign:18 http://gb.archive.ubuntu.com/ubuntu focal-updates/restricted arm64 Packages
Ign:43 http://ports.ubuntu.com/ubuntu-ports focal-security/main i386 Packages
Ign:47 http://ports.ubuntu.com/ubuntu-ports focal-security/restricted i386 Packages
Ign:19 http://gb.archive.ubuntu.com/ubuntu focal-updates/universe arm64 Packages
Ign:21 http://gb.archive.ubuntu.com/ubuntu focal-updates/multiverse arm64 Packages
Ign:48 http://ports.ubuntu.com/ubuntu-ports focal-security/universe i386 Packages
Ign:43 http://ports.ubuntu.com/ubuntu-ports focal-security/main i386 Packages
Ign:38 http://gb.archive.ubuntu.com/ubuntu focal/main arm64 Packages
Ign:39 http://gb.archive.ubuntu.com/ubuntu focal/restricted arm64 Packages
Ign:40 http://gb.archive.ubuntu.com/ubuntu focal/universe arm64 Packages
Ign:41 http://gb.archive.ubuntu.com/ubuntu focal/multiverse arm64 Packages
Ign:47 http://ports.ubuntu.com/ubuntu-ports focal-security/restricted i386 Packages
Ign:48 http://ports.ubuntu.com/ubuntu-ports focal-security/universe i386 Packages
Ign:38 http://gb.archive.ubuntu.com/ubuntu focal/main arm64 Packages
Ign:39 http://gb.archive.ubuntu.com/ubuntu focal/restricted arm64 Packages
Ign:40 http://gb.archive.ubuntu.com/ubuntu focal/universe arm64 Packages
Ign:43 http://ports.ubuntu.com/ubuntu-ports focal-security/main i386 Packages
Ign:47 http://ports.ubuntu.com/ubuntu-ports focal-security/restricted i386 Packages
Ign:41 http://gb.archive.ubuntu.com/ubuntu focal/multiverse arm64 Packages
Err:38 http://gb.archive.ubuntu.com/ubuntu focal/main arm64 Packages
  404  Not Found [IP: 91.189.88.152 80]
Ign:39 http://gb.archive.ubuntu.com/ubuntu focal/restricted arm64 Packages
Ign:48 http://ports.ubuntu.com/ubuntu-ports focal-security/universe i386 Packages
Ign:43 http://ports.ubuntu.com/ubuntu-ports focal-security/main i386 Packages
Ign:40 http://gb.archive.ubuntu.com/ubuntu focal/universe arm64 Packages
Ign:41 http://gb.archive.ubuntu.com/ubuntu focal/multiverse arm64 Packages
Ign:47 http://ports.ubuntu.com/ubuntu-ports focal-security/restricted i386 Packages
Ign:48 http://ports.ubuntu.com/ubuntu-ports focal-security/universe i386 Packages
Err:43 http://ports.ubuntu.com/ubuntu-ports focal-security/main i386 Packages
  404  Not Found [IP: 2001:67c:1360:8001::22 80]
Ign:47 http://ports.ubuntu.com/ubuntu-ports focal-security/restricted i386 Packages
Ign:48 http://ports.ubuntu.com/ubuntu-ports focal-security/universe i386 Packages
Hit:49 http://ppa.launchpad.net/yktooo/ppa/ubuntu focal InRelease
Fetched 757 kB in 3s (254 kB/s)
Reading package lists... Done
E: Failed to fetch http://gb.archive.ubuntu.com/ubuntu/dists/focal-updates/main/binary-arm64/Packages  404  Not Found [IP: 91.189.88.152 80]
E: Failed to fetch http://gb.archive.ubuntu.com/ubuntu/dists/focal/main/binary-arm64/Packages  404  Not Found [IP: 91.189.88.152 80]
E: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/focal-security/main/binary-i386/Packages  404  Not Found [IP: 2001:67c:1360:8001::22 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.