About Teapot - message from Developer:
https://bitbucket.org/ArminW/teapot/issue/28/fails-to-launch#comment-2720600
"It's quite a while that I saw this last time, if I remember correctly its happening if mesa drivers aren't installed (libgl1-mesa-glx libglu1-mesa in debian squeeze, probably the same in ubuntu). However, teapot isn't under active development anymore, sadly "real life" doesn't leave time for that. I recommend using Firestorm as a Viewer-3 style viewer, or Cool-VL-Viewer or Singularity for an up-to-date Viewer-1 style viewer. Singularity has a Linux 64bit version, the others to my knowledge are only available as 32bit versions."
I set Singularity and it works, but it's interface is different from standard LL - which is like me very much.