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You need Ubuntu 18.04.6 LTS (Bionic Beaver) . This was the final release to include the 32-bit server installer.
Let's benchmark the vibe. A 32-bit kernel vs. 64-bit on the same old Atom D525 processor: ubuntu server 32 bit
ubuntu-server-32-bit-guide
Have a legacy 32-bit war story? Drop it in the comments below. You need Ubuntu 18
First, the hard truth: Canonical stopped producing them. ubuntu server 32 bit