Comment 26 for bug 1257413

I can confirm this issue since Ubuntu 17.10 and it still appears on Ubuntu 18.04. Even the flatpack variant of Inkscape is affected.
In my case it appears even in simple SVG documents but always with text editing.

I'm using noveau drivers on an XPS 15 9550 in case that makes any difference. Let me know if I could help by providing some data.

I have the feeling that these are duplicates:

https://bugs.launchpad.net/ubuntu/+source/inkscape/+bug/1385009
https://bugs.launchpad.net/ubuntu/+source/inkscape/+bug/406036

and this seems to be a similar issue on redhat:
https://bugzilla.redhat.com/show_bug.cgi?id=544590