Suitesparse bug on Ubuntu 20.04

Since I updated Ubuntu from version 19.10 to 20.04 the tests umfpackamgtest, umfpackfastamgtest, umfpacktest and spqrtest are all failing due to a timeout error. The Suitesparse library is hereby the (only) Ubuntu-Repository version for Ubuntu 20.04 (and got updated together with Ubuntu from version 5.4.0 to 5.7.1).

In my concrete case this means that my code is getting compiled without error, but then it is just hanging when trying to run UMFPack and/or Cholmod (which where working perfectly fine on Ubuntu 19.10 with Suitesparse 5.4.0).