I got this notice via email. Since I run Ubuntu MATE as my primary desktop, I did a run of Update Manager, expecting to see āAn upgrade to version 24.04.4 is availableā, similar to what I saw for 24.04.3 Alas, nothing. Is that because āUbuntu MATE was notofficially involved in this releaseā? That strikes me as odd, since the base product is incremented, I would expect the new point release to show up in MATE.
If not, will MATE still receive all the same updates as 24.04.4?
If you're already running Ubuntu 24.04 LTS, the upgrade is just a normal upgrade.
The point release really refers to new media being released, which doesn't apply to existing users of the Ubuntu 24.04 LTS release, ie. from the first announcement link is the following
For existing users, they were using Ubuntu [MATE] 24.04 LTS before ISO release, and will still be running Ubuntu [MATE] 24.04 LTS after release.
The point release details (.3 or .4) is not really significant, except maybe
for new installs (kernel packages changed for Ubuntu MATE & flavors at the .2 point release to prior media),
an indication of what kernel you're using (if using the HWE stack and thus there is change; there is no change for users using the GA kernel stack. Ubuntu 24.04.3 used the 6.14 kernel, Ubuntu 24.04.4 uses the 6.17 kernel with HWE, but both .3 & .4 use 6.8 if using GA kernel stack),
an easy indication that all upgrades have been applied.
In actuality, the point release shows when the base-files package is updated only, but that is the last package that is released/applied with the point release upgrade packages.
As long as users apply normal upgrades, ie.
sudo apt update to update software lists so your machine knows what package updates are available (assuming your software lists are correct, not disabled etc)
sudo apt upgrade to apply the upgrades available (in rare cases some users will also need sudo apt full-upgrade, but it shouldn't be necessary on stable releases with default repositories only, but some third party packages & ESM/development releases can need this)
users will find their 24.04 system upgrade from .3 to .4 without any notification.
Existing users actually applied that update earlier this week; though due to package phasing some users may have had that delayed (upgrades were seen by my system where I was looking for it late Monday [9th Feb] of this week).
Read what @tkn wrote if you're in a hurry far fewer words, though I hope I've given more detail.
Ubuntu MATE 24.04 & Ubuntu MATE 24.04.1 media installed the GA kernel stack; if you used Ubuntu MATE 24.04.2 (or later) point release media your kernel stack will be HWE; it's just a package difference as documented here. All flavors still follow the default as used by Ubuntu 18.04 LTS Desktop (& earlier).