I just finished updating my laptop to the latest Linux Mint 20 (based on Ubuntu 20.04) and once I tried re-installing Chirp, I got this error message:

The following packages have unmet dependencies:
 chirp-daily : Depends: python-libxslt1 which is a virtual package and is not provided by any available package

               Depends: python-gtk2 which is a virtual package and is not provided by any available package

               Depends: python-serial which is a virtual package and is not provided by any available package

               Depends: python-suds which is a virtual package and is not provided by any available package

A little Googling led me to this work around, which is basically to point the repository to xenial instead of focal, to install the dependencies manually, and to try the install again.

It seemed to have worked, although I'm not too happy about having installed dependencies manually. I uploaded the dependencies on Sync in case the original link stops working.