Am Donnerstag, 2. Juni 2016 um 10:29:48, schrieb John Kane <>
> I was tired and hungary when I did it, and while I remember using a
> terminal command, I have not the slightest memeory of how I did it.
> Exactly how would I check?
> So far this morning I have tried something like
> apt-cache showpkg qt4  (& qt4.5, 4.6 and so on ) and get nothing
>  apt-cache showpkg qt5.6 gets a hit even though I thought I'd removed it.
> I read the Release Notes and originally thought that installing qt5.6 would
> be a good idea and then read what seemed to be some caveats  that seemed to
> suggest that installing qt5.6 after installing LyX2.2.0 might cause
> problems. So I thought I'd better get rid of it.
> A quick look at /usr/share/  shows I have both qt4 and qt5 (apparently
> qt5.6 since that is the folder label and the name I used in the apt-get
> install command
> I am not exacty Linux fluent. (I possibly speak pidgin Linux?) Can someone
> provide detailed instructions or a pointer to a decent cheatsheet that
> would show me how to figure out what version of qt LyX is using please?

Try this:
        # ldd  <path-to-lyx-executable> | egrep -i qt


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