Hello, I’m sorry I’m still using ubuntu 18.04. As you said it should be easy to fix, probably just a link. Thank’s for your positive experience with using docker option. Fred On 7 Apr 2021, at 19:19, Max Funk mf3@users.sourceforge.net wrote: Hello, I have the same problem: blacs not working in current Ubuntu 20.04 However, I found that in Ubuntu 16.04 there were the packages libblacs-openmpi-dev and libblacs-openmpi1 which contain some "blacs" library files Now, in Ubuntu 20.04, there is only a "virtual"...