The thing with Ubuntu / Canonical isn't that it doesn't work, it is that they've bad policies and by using their stuff you're making yourself vulnerable to something akin to what happened with VMWare ESXi or with CentOS licensing - they may change their mind at some point and you'll be left with a pile of machines and little to no time to move to other solution.

For starters Ubuntu is the only serious and corporate-backed distribution to ever release a major version on the website and have the ISO installer broken for a few days.

Ubuntu’s kernel is also a dumpster fire of hacks waiting for someone upstream to implement things properly so they can backport them and ditch their own implementations. We've seen this multiple times, shiftfs vs VFS idmap shifting is a great example of the issue.

Canonical has contributing to open-source for a long time, but have you heard about what happened with LXD/LXC? LXC was made with significant investments, primarily from IBM and Canonical. LXD was later developed as an independent project under the Linux Containers umbrella, also funded by Canonical. Everything seemed to be progressing well until last year when Canonical announced that LXD would no longer remain an independent project. They removed it from the Linux Containers project and brought it under in-house development.

They effectively took control of the codebase, changed repositories, relicensed previous contributions under a more restrictive license. To complicate matters, they required all contributors to sign a contract with new limitations and impositions. This shift has caused concerns, but most importantly LXD became essentially a closed-off in-house project of Canonical.

Some people may be annoyed at Snaps as well but I won't get into that.