I found the ten brush hotkeys plug-in that used to come with Krita very useful, but it doesn't appear to be included in the latest release — at least not in the build that's on the Ubuntu repository. Can I download this plug-in separately somewhere?

it should be in by default. Check settings->configure Krita->python plugin manager, and see if it is greyed-out. if so, hovering over it will produce a tooltip with the error that stops it from loading, can you then make a screenshot of that?

Also, how did you obtain your copy of Krita, apt? snap? appimage?

The plug-in menu is completely empty. Notably my installation of Krita does still have keybindings for the ten brushes and ten scripts plug-ins but I suppose those are just remainders of when I did have those plug-ins.

I got this from Apt. I'm on Linux Mint, so Snaps aren't really an option (at least not an easy one).

Well, looks like the apt mint provides is broken. Use the official appimage download instead, please.

@Zowie possibly there is some "recommended" package that you haven't installed together with the base Krita one? Maybe they decided to put Python as optional package and installing `krita`.

From `apt depends krita` I got this output:

(...)
Recommended: libpython3-dev
Recommended: python3-sip
Recommended: python3-pyqt5
Recommended: qml-module-qtmultimedia
Suggested: colord
colord:i386
Suggested: ffmpeg
ffmpeg:i386
Suggested: krita-l10n

So it doesn't try to install python on its own. Maybe install it fully with the Python packages I mentioned and then check again?

I've installed the official Ubuntu PPA build now, which does have all the built-in plug-ins. Thanks for the help, everyone.

@tymond
It looks like I already had all the recommended packages installed from other program's dependencies, so I don't think that's the cause.