Tried to install flatpak Chromium, to no avail:
5. [✗] org.chromium.Chromium stable i flathub < 102.8 MB
Error: org.chromium.Chromium needs a later flatpak version
error: Failed to install org.chromium.Chromium: app/org.chromium.Chromium/x86_64/stable needs a later flatpak version (1.8.2)
Flatpak 1.8.2 is available starting with Groovy:
$ rmadison flatpak
flatpak | 0.11.3-3 | bionic/universe | source, amd64, arm64, armhf, i386, ppc64el, s390x
flatpak | 1.0.8-0ubuntu0.18.04.1 | bionic-security/universe | source, amd64, arm64, armhf, i386, ppc64el, s390x
flatpak | 1.0.9-0ubuntu0.1 | bionic-updates/universe | source, amd64, arm64, armhf, i386, ppc64el, s390x
flatpak | 1.6.3-1 | focal/universe | source, amd64, arm64, armhf, ppc64el, riscv64, s390x
flatpak | 1.6.5-0ubuntu0.1 | focal-updates/universe | source, amd64, arm64, armhf, ppc64el, riscv64, s390x
flatpak | 1.8.2-1 | groovy/universe | source, amd64, arm64, armhf, ppc64el, riscv64, s390x
flatpak | 1.8.4-1 | hirsute/universe | source, amd64, arm64, armhf, ppc64el, riscv64, s390x
I guess I could remove the official Flatpak and use some PPA instead, but it would pretty much undermine the whole idea of getting your software from a trusted source. Snap Chromium is painfully slow on my system for some reason. (As well as snap Firefox.) So, any options left?
There is nothing to fear.
Official FlatPak setup guide https://flatpak.org/setup/Ubuntu/ lists the PPA.
So you have to open terminal and type:
Note: I'm using Ubuntu MATE 18.04 LTS, so the PPA is also needed for me.