Canonical provides 32- and 64-bit images for Ubuntu and it's been like this for a long time, since the first edition that came out in 2004. Now, an Ubuntu contributor is looking to change this by proposing that Canonical drop 32-bit support after the release of 16.04 LTS.
The 32- and 64-bit architectures have not been on equal footing for many years. The majority of people are now using the 64-bit edition, although it's safe to say that 32-bit is not exactly gone. If we take a look at the Steam for Linux hardware survey, we'll notice that Ubuntu 14.04.1 LTS 32-bit is actually occupying the fourth place, which is rather weird. Right now, according to Steam, there are seven times more 64-bit users than 32-bit users, but that's hardly enough for a big change.