My mid-2010 iMac is supported by Apple up to MacOS 10.13 (High Sierra). As the iMac is in fine condition still, I moved to Ubuntu 22.04. Which I already have on a 2008 (!) Macbook Pro, and an Acer Timeline laptop.
Long story short
Copied the full contents of the (MacOS) home directory to the fresh installed Ubuntu home.
A custom script for opening the MacOS (.webloc) web-links in Ubuntu by just double-clicking.
The MacOS alias could not be that easily used. Replaced those by symlinks, thus losing the refined functionality (of the alias), with a Python-script and, for batch-processing, this shell-script.
MacOS alias to symlink (Python) script: alias2symlink.py
Find MacOS alias files shell script: find_bookmarks.sh
Open MacOS web-links (.webloc) in Ubuntu: open_webloc.sh