Both ubuntu update and upgrade fails irrespective of mirrors used for the main component with the following errors. This prevents the system from being up to date and installing new packages.
Update log
Ign:14 http://mirrors.piconets.webwerks.in/ubuntu-mirror/ubuntu jammy amd64 Contents (deb)
Ign:14 http://mirrors.piconets.webwerks.in/ubuntu-mirror/ubuntu jammy amd64 Contents (deb)
Err:14 http://mirrors.piconets.webwerks.in/ubuntu-mirror/ubuntu jammy amd64 Contents (deb)
Connection failed [IP: 43.240.66.200 80]
Fetched 252 MB in 3min 44s (1,127 kB/s)
Reading package lists... Done
E: Failed to fetch http://mirrors.piconets.webwerks.in/ubuntu-mirror/ubuntu/dists/jammy/Contents-amd64 Connection failed [IP: 43.240.66.200 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
Upgrade log
Ign:21 http://mirrors.piconets.webwerks.in/ubuntu-mirror/ubuntu jammy amd64 Contents (deb)
Err:21 http://mirrors.piconets.webwerks.in/ubuntu-mirror/ubuntu jammy amd64 Contents (deb)
Connection failed [IP: 43.240.66.200 80]
Fetched 249 MB in 2min 1s (2,054 kB/s)
Reading package lists... Done
E: Failed to fetch http://mirrors.piconets.webwerks.in/ubuntu-mirror/ubuntu/dists/jammy/Contents-amd64 Connection failed [IP: 43.240.66.200 80]
E: Failed to fetch https://ubuntu-ports.mirror.net.in/dists/jammy/main/binary-i386/Packages 404 Not Found [IP: 103.195.68.3 443]
E: Failed to fetch https://ubuntu-ports.mirror.net.in/dists/jammy-updates/main/binary-i386/Packages 404 Not Found [IP: 103.195.68.3 443]
E: Failed to fetch https://ubuntu-ports.mirror.net.in/dists/jammy-backports/main/binary-i386/Packages 404 Not Found [IP: 103.195.68.3 443]
E: Failed to fetch https://ubuntu-ports.mirror.net.in/dists/jammy-security/main/binary-amd64/Packages 404 Not Found [IP: 103.195.68.3 443]
E: Some index files failed to download. They have been ignored, or old ones used instead.
bhargav@bhargav-Lenovo-Legion-Y540-15IRH-PG0:~$
Initially though that my ISP was blocking URLs but the other machine within the same network works perfectly fine.
Mirrors tried till now,
http://archive.ubuntu.com/ubuntu
https://ubuntu-ports.mirror.net.in
https://mirror.renu.ac.ug/ubuntu
http://in.archive.ubuntu.com/ubuntu
http://mirrors.piconets.webwerks.in/ubuntu-mirror/ubuntu
Here is log with archive.ubuntu.com
Hit:1 http://archive.ubuntu.com/ubuntu jammy InRelease
Hit:2 http://archive.ubuntu.com/ubuntu jammy-updates InRelease
Hit:3 http://archive.ubuntu.com/ubuntu jammy-backports InRelease
Hit:4 http://archive.ubuntu.com/ubuntu jammy-security InRelease
Hit:5 https://apt.kitware.com/ubuntu focal InRelease
Get:6 http://archive.ubuntu.com/ubuntu jammy amd64 Contents (deb) [46.9 MB]
Ign:6 http://archive.ubuntu.com/ubuntu jammy amd64 Contents (deb)
Get:7 http://archive.ubuntu.com/ubuntu jammy i386 Contents (deb) [36.9 MB]
Get:8 http://archive.ubuntu.com/ubuntu jammy/main amd64 c-n-f Metadata [30.3 kB]
Get:9 http://archive.ubuntu.com/ubuntu jammy/restricted amd64 Packages [129 kB]
Get:10 http://archive.ubuntu.com/ubuntu jammy/restricted i386 Packages [30.4 kB]
Get:11 http://archive.ubuntu.com/ubuntu jammy/restricted Translation-en [18.6 kB]
Get:12 http://archive.ubuntu.com/ubuntu jammy/restricted amd64 c-n-f Metadata [488 B]
Get:13 http://archive.ubuntu.com/ubuntu jammy/universe i386 Packages [7,474 kB]
Get:14 http://archive.ubuntu.com/ubuntu jammy/universe amd64 Packages [14.1 MB]
Get:15 http://archive.ubuntu.com/ubuntu jammy/universe Translation-en [5,652 kB]
Get:16 http://archive.ubuntu.com/ubuntu jammy/universe amd64 DEP-11 Metadata [3,559 kB]
Get:17 http://archive.ubuntu.com/ubuntu jammy/universe DEP-11 48x48 Icons [3,447 kB]
Ign:17 http://archive.ubuntu.com/ubuntu jammy/universe DEP-11 48x48 Icons
Get:18 http://archive.ubuntu.com/ubuntu jammy/universe DEP-11 64x64 Icons [7,609 kB]
Get:18 http://archive.ubuntu.com/ubuntu jammy/universe DEP-11 64x64 Icons [7,609 kB]
Get:19 http://archive.ubuntu.com/ubuntu jammy/universe DEP-11 64x64@2 Icons [69.3 kB]
Get:20 http://archive.ubuntu.com/ubuntu jammy/universe amd64 c-n-f Metadata [286 kB]
Get:21 http://archive.ubuntu.com/ubuntu jammy/multiverse amd64 Packages [217 kB]
Get:22 http://archive.ubuntu.com/ubuntu jammy/multiverse i386 Packages [112 kB]
Get:23 http://archive.ubuntu.com/ubuntu jammy/multiverse Translation-en [112 kB]
Get:24 http://archive.ubuntu.com/ubuntu jammy/multiverse amd64 DEP-11 Metadata [42.1 kB]
Get:25 http://archive.ubuntu.com/ubuntu jammy/multiverse DEP-11 48x48 Icons [42.7 kB]
Get:26 http://archive.ubuntu.com/ubuntu jammy/multiverse DEP-11 64x64 Icons [193 kB]
Get:27 http://archive.ubuntu.com/ubuntu jammy/multiverse DEP-11 64x64@2 Icons [214 B]
Get:28 http://archive.ubuntu.com/ubuntu jammy/multiverse amd64 c-n-f Metadata [8,372 B]
Ign:6 http://archive.ubuntu.com/ubuntu jammy amd64 Contents (deb)
Get:17 http://archive.ubuntu.com/ubuntu jammy/universe DEP-11 48x48 Icons [3,447 kB]
Ign:17 http://archive.ubuntu.com/ubuntu jammy/universe DEP-11 48x48 Icons
Ign:6 http://archive.ubuntu.com/ubuntu jammy amd64 Contents (deb)
Ign:17 http://archive.ubuntu.com/ubuntu jammy/universe DEP-11 48x48 Icons
Err:6 http://archive.ubuntu.com/ubuntu jammy amd64 Contents (deb)
Connection failed [IP: 91.189.91.38 80]
Ign:17 http://archive.ubuntu.com/ubuntu jammy/universe DEP-11 48x48 Icons
Fetched 73.3 MB in 5min 53s (208 kB/s)
Reading package lists... Done
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/jammy/Contents-amd64 Connection failed [IP: 91.189.91.38 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.