Ubuntu LTS has the same frequency as Debian Stable releases (2 years). There are the non-LTS Ubuntu releases, but they are supported for a short period (I think

Ubuntu LTS has the same frequency as Debian Stable releases (2 years). There are the non-LTS Ubuntu releases, but they are supported for a short period (I think 6-9 months, but I'd need to check, and the files are deleted soon after support ends), which can be a problem if you don't update to the new version fast enough, and get stuck with a system than can neither be updated to a future version (LTS or non-LTS), nor downgraded to a previous LTS, and so you must reinstall everything from scratch (this happened to a colleague of mine, partially their fault for not updating, but Debian's release process doesn't let this happen). My experience is don't run Canonical-developed (as in it originated from Canonical) software, it almost always breaks, get dropped, or they decide to screw around with the licensing. I think early on they tried to copy Fedora (e.g. having the latest by pulling from Debian unstable, 6-month releases), but now they're trying for the enterprise (and trying to copy RHEL), but they lack Red Hat's culture to pull it off.