Thank you very much, Jean-Marc. It seems, that you gave me an important hint for the solution of my problem.
I have installed the "gpaste"-extension for the GNOME Shell, which is provided as a package of Ubuntu 16.04. It seems that gpaste has some severe bugs. As soon as I remove it, the text selection problems in LyX are totally gone. It is a little bit strange, that this affects only LyX and no other programs. Therefore I never thought, that gpaste could be the cause of this problem. In Debian 8 gpaste works fine with LyX and generally all programs. I will now test the situation on all of my four computers, where I have installed LyX / Ubuntu 16.04. If the removal of gpaste also clears the problems in LyX everywhere, then I think we have found the solution. Thank you so much, with best wishes, Hermann Josef Am Thu, 09 Jun 2016 12:22:34 +0200 schrieb Jean-Marc Lasgouttes: > Le 08/06/2016 à 09:06, Hermann J. Eckl a écrit : >> Currently I have installed Ubuntu 16.04 LTS - and am facing a very >> strange an annoying problem: I have difficulties to select longer or >> even shortes pieces of text with the keyboard or mouse. > > That seems very strange an annoying indeed. > >> If I am trying to select some text, the selection captures only short >> passages and fails after some words or paragraphs, regardless of >> whether I am selecting with the mouse or with keyboard shortcuts. ALl >> other programmes (text editor, Libre Office etc.) are working correctly >> and I can select text withput any problems. > > Do you run any utilisty related to clipboard (clipboard manager of some > sort)? > > JMarc
