Lubuntu drops support for 32 bit machines.

[W9FTV]

"As an increasing number of Linux distributions have focused their attention on the 64-bit x86 architecture (amd64) and not on i386, we have found that it is harder to support than it once was. With i386-only machines becoming an artifact of the past, it has become increasingly clear to the Lubuntu Team that we need to evaluate its removal from the architectures we support. After careful consideration, we regret to inform our users that Lubuntu 19.04 and future versions will not see a release for the i386 architecture. Please do note that we will continue to support Lubuntu 18.04 LTS i386 users as a first-class citizen until its End of Life date in April of 2021."
https://betanews.com/2018/12/21/lubuntu-linux-32bit/

ED: Expect more Linux distributions to follow suit in the near future.