Discussion around 32-bit Ubuntu has been renewed in a mailing list post this week, spearheaded by a proposal from Canonical’s Dimitri John Ledkov.
Plans currently to drop Ubuntu 32-bit desktop and server images later this year.
The debate has nothing to do with planned obsolescence and everything to do with security, merit and value.
As Ledkov explains, maintaining and building 32-bit Ubuntu images is slowing the development and comes at the cost of utilizing our build farm, QA and validation time.
The 32-bit architecture is a disappearing field of technology these days.
”Whilst we have scalable build-farms, i386 still requires all packages, auto package tests, and ISOs to be revalidated across our infrastructure [and] take up mirror space & bandwidth” the software engineer adds.

Source omgubuntu.