Hi i am not a Linux expert, but my idea was to delete the “calf.so” in the folder /usr/lib/ladspa.
On my workstation it works fine wit no more crushes or other problemes. Since them all calf plug in works fine
UBUNTU STUDIO 18
Calf plugins at this time are known to cause issues, some people manage to work fine with them, but they cause a huge amount more issues than most plugins.
Seablade