Maintaining Ubuntu PPAs
I started backporting stable packages to Ubuntu LTS releases (Bionic and Focal) recently; see my Launchpad profile here.
Some of these packages are now included in the "EC PPA Bionic Backports" repository, which provides for instance PHP 7.4 to Bionic-based Linux workstations, backported from Focal and supported until April 2025.
You might want to use this PPA if you prefer stability over bleeding edge.
There are also backports from Ubuntu Groovy to Ubuntu Focal here, for instance