An install of Ubuntu 20.04 server using the ubuntu-20.04.4-live-server-amd64.iso installs the iptables package and creates links in /sbin. The symbolic links are different, but they are there.
An upgrade should update the symbolic links instead of removing them. Servers that have been upgraded form Ubuntu 18 to Ubuntu 20 have a different behavior than servers that were installed as either Ubuntu 18 or 20. # lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 20.04.4 LTS Release: 20.04 Codename: focal # ls -al /sbin/ip*tables* lrwxrwxrwx 1 root root 27 Feb 23 08:55 /sbin/ip6tables -> /etc/alternatives/ip6tables lrwxrwxrwx 1 root root 14 Feb 28 2020 /sbin/ip6tables-apply -> iptables-apply lrwxrwxrwx 1 root root 20 Feb 28 2020 /sbin/ip6tables-legacy -> xtables-legacy-multi lrwxrwxrwx 1 root root 20 Feb 28 2020 /sbin/ip6tables-legacy-restore -> xtables-legacy-multi lrwxrwxrwx 1 root root 20 Feb 28 2020 /sbin/ip6tables-legacy-save -> xtables-legacy-multi lrwxrwxrwx 1 root root 17 Feb 28 2020 /sbin/ip6tables-nft -> xtables-nft-multi lrwxrwxrwx 1 root root 17 Feb 28 2020 /sbin/ip6tables-nft-restore -> xtables-nft-multi lrwxrwxrwx 1 root root 17 Feb 28 2020 /sbin/ip6tables-nft-save -> xtables-nft-multi lrwxrwxrwx 1 root root 35 Feb 23 08:55 /sbin/ip6tables-restore -> /etc/alternatives/ip6tables-restore lrwxrwxrwx 1 root root 17 Feb 28 2020 /sbin/ip6tables-restore-translate -> xtables-nft-multi lrwxrwxrwx 1 root root 32 Feb 23 08:55 /sbin/ip6tables-save -> /etc/alternatives/ip6tables-save lrwxrwxrwx 1 root root 17 Feb 28 2020 /sbin/ip6tables-translate -> xtables-nft-multi lrwxrwxrwx 1 root root 26 Feb 23 08:55 /sbin/iptables -> /etc/alternatives/iptables -rwxr-xr-x 1 root root 7057 Feb 28 2020 /sbin/iptables-apply lrwxrwxrwx 1 root root 20 Feb 28 2020 /sbin/iptables-legacy -> xtables-legacy-multi lrwxrwxrwx 1 root root 20 Feb 28 2020 /sbin/iptables-legacy-restore -> xtables-legacy-multi lrwxrwxrwx 1 root root 20 Feb 28 2020 /sbin/iptables-legacy-save -> xtables-legacy-multi lrwxrwxrwx 1 root root 17 Feb 28 2020 /sbin/iptables-nft -> xtables-nft-multi lrwxrwxrwx 1 root root 17 Feb 28 2020 /sbin/iptables-nft-restore -> xtables-nft-multi lrwxrwxrwx 1 root root 17 Feb 28 2020 /sbin/iptables-nft-save -> xtables-nft-multi lrwxrwxrwx 1 root root 34 Feb 23 08:55 /sbin/iptables-restore -> /etc/alternatives/iptables-restore lrwxrwxrwx 1 root root 17 Feb 28 2020 /sbin/iptables-restore-translate -> xtables-nft-multi lrwxrwxrwx 1 root root 31 Feb 23 08:55 /sbin/iptables-save -> /etc/alternatives/iptables-save lrwxrwxrwx 1 root root 17 Feb 28 2020 /sbin/iptables-translate -> xtables-nft-multi -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to iptables in Ubuntu. https://bugs.launchpad.net/bugs/1966133 Title: /sbin/ip*tables* symbolic links removed when upgrading from 18.04 to 20.04 Status in iptables package in Ubuntu: Incomplete Bug description: When upgraded from Ubuntu 18.04 to Ubuntu 20.04 the symbolic links in /sbin are removed. Before upgrade # ls -al /sbin/ip*tables* lrwxrwxrwx 1 root root 13 Nov 12 2017 /sbin/ip6tables -> xtables-multi lrwxrwxrwx 1 root root 13 Nov 12 2017 /sbin/ip6tables-restore -> xtables-multi lrwxrwxrwx 1 root root 13 Nov 12 2017 /sbin/ip6tables-save -> xtables-multi lrwxrwxrwx 1 root root 13 Nov 12 2017 /sbin/iptables -> xtables-multi lrwxrwxrwx 1 root root 13 Nov 12 2017 /sbin/iptables-restore -> xtables-multi lrwxrwxrwx 1 root root 13 Nov 12 2017 /sbin/iptables-save -> xtables-multi # dpkg -S /sbin/ip*tables* iptables: /sbin/ip6tables iptables: /sbin/ip6tables-restore iptables: /sbin/ip6tables-save iptables: /sbin/iptables iptables: /sbin/iptables-restore iptables: /sbin/iptables-save After upgrade # ls -al /sbin/ip*tables* ls: cannot access '/sbin/ip*tables*': No such file or directory To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/iptables/+bug/1966133/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
