This seems very one-sided. Sure, the disclosure was not handled perfectly. However, this post completely ignores the terrible response by the CUPS team.
The point on NAT is certainly fair and prevented this from being a much bigger issue. Still, many affected systems were reachable from the internet.
Lastly, the author tries to downplay the impact of an arbitrary execution vulnerabilty because app armour might prevent it from fully compromising the system. Sure, so I guess we don’t need to fix any of those vulnerabilities /s.
It seems that 18.04 was the last release for 32-bit x86 (i386): https://askubuntu.com/questions/1376090/latest-version-of-ubuntu-for-i386-architecture-32-bit
But you could just go for Debian which still supports it.