download  install  test and skin XnViewMP  on Ubuntu .

You can download tar.gz or DEB here      click a thumbnail to enlarge

1-download-save file-click OK.	2- save on desktop.	3-extract here.
4-open folder XnViewMP.	5-open xnview.sh.	6-click Run.
7-here we are, in Pictures directory - select yellow butterfly.	8-Then double-click on thumbnail.	9-Or click fullscreen.