Hi, people
I have Trios Linux installed, it's Debian Jessie-based distribution without systemd. After I've installed InkCut 1.0 - extension on Inkscape 0.91, I got similar to this picture.

Line rounded by red circle.

Do the other submenus work as expected?
Is Inkcut the only extension in the Cutter / Plotter category?

If yes for both questions:
This looks as if the .inx file for the extension were broken in some way. You should contact the author of the extension and ask for a fix, after you have made sure that the .inx file has been copied correctly to your user extension directory.

@Moini
1. Yes, the other submenus work properly.
2. InkCut is the only extension in Cutter/Plotter category.
3.

[root@banjah2002][/home/bane/.config/inkscape/extensions]# ls
inkcut inkcutext1.inx

I'll try to contact the author.

Thanks for help.