Hi
Thanks, that is an interesting possibility. Nominally, Ubuntu 18.04 uses QT 5. The output of the one liner you gave me is below, and that seems to be the case, but I'm not sure about the exact-exact version or build.
I will note that I just installed Xubuntu on a laptop and tested Rstudio (but did not really use it, so I can't be sure) and there were no problems on that.
Since I'm using on my desktop what is probably the most commonly used form of Ubuntu, and I've not seen anyone else with this problem, it may be something more specific to my case. The install is fairly fresh, and I don't have anything that I think is strange going on. But, one could argue that Gnome 3.X is itself fairly iffy with the gnome extensions, of which I have a few.
Now that I think of it, I'll try removing gnome extensions to see if the problem goes away.
^[greg@cj:~lsof -p pgrep -x rstudio
| grep Qt
rstudio 28221 greg mem REG 8,5 488320 23077050 /usr/lib/rstudio/lib/libQt5Svg.so.5
rstudio 28221 greg mem REG 8,5 2231768 23077058 /usr/lib/rstudio/lib/libQt5XcbQpa.so.5
rstudio 28221 greg mem REG 8,5 124376 23077047 /usr/lib/rstudio/lib/libQt5QuickWidgets.so.5
rstudio 28221 greg mem REG 8,5 6321136 23077045 /usr/lib/rstudio/lib/libQt5Qml.so.5
rstudio 28221 greg mem REG 8,5 8172640 23077038 /usr/lib/rstudio/lib/libQt5Core.so.5
rstudio 28221 greg mem REG 8,5 7848552 23077040 /usr/lib/rstudio/lib/libQt5Gui.so.5
rstudio 28221 greg mem REG 8,5 8443120 23077057 /usr/lib/rstudio/lib/libQt5Widgets.so.5
rstudio 28221 greg mem REG 8,5 2250464 23077041 /usr/lib/rstudio/lib/libQt5Network.so.5
rstudio 28221 greg mem REG 8,5 6604880 23077046 /usr/lib/rstudio/lib/libQt5Quick.so.5
rstudio 28221 greg mem REG 8,5 814672 23077043 /usr/lib/rstudio/lib/libQt5Positioning.so.5
rstudio 28221 greg mem REG 8,5 176640 23077053 /usr/lib/rstudio/lib/libQt5WebChannel.so.5
rstudio 28221 greg mem REG 8,5 119136328 23077055 /usr/lib/rstudio/lib/libQt5WebEngineCore.so.5
rstudio 28221 greg mem REG 8,5 786960 23077039 /usr/lib/rstudio/lib/libQt5DBus.so.5
rstudio 28221 greg mem REG 8,5 657840 23077044 /usr/lib/rstudio/lib/libQt5PrintSupport.so.5
rstudio 28221 greg mem REG 8,5 428328 23077056 /usr/lib/rstudio/lib/libQt5WebEngineWidgets.so.5
rstudio 28221 greg 96r REG 8,5 2231768 23077058 /usr/lib/rstudio/lib/libQt5XcbQpa.so.5
rstudio 28221 greg 140r REG 8,5 124376 23077047 /usr/lib/rstudio/lib/libQt5QuickWidgets.so.5
rstudio 28221 greg 141r REG 8,5 6321136 23077045 /usr/lib/rstudio/lib/libQt5Qml.so.5
rstudio 28221 greg 153r REG 8,5 8172640 23077038 /usr/lib/rstudio/lib/libQt5Core.so.5
rstudio 28221 greg 154r REG 8,5 7848552 23077040 /usr/lib/rstudio/lib/libQt5Gui.so.5
rstudio 28221 greg 155r REG 8,5 8443120 23077057 /usr/lib/rstudio/lib/libQt5Widgets.so.5
rstudio 28221 greg 156r REG 8,5 2250464 23077041 /usr/lib/rstudio/lib/libQt5Network.so.5
rstudio 28221 greg 157r REG 8,5 6604880 23077046 /usr/lib/rstudio/lib/libQt5Quick.so.5
rstudio 28221 greg 158r REG 8,5 814672 23077043 /usr/lib/rstudio/lib/libQt5Positioning.so.5
rstudio 28221 greg 159r REG 8,5 176640 23077053 /usr/lib/rstudio/lib/libQt5WebChannel.so.5
rstudio 28221 greg 160r REG 8,5 119136328 23077055 /usr/lib/rstudio/lib/libQt5WebEngineCore.so.5
rstudio 28221 greg 161r REG 8,5 786960 23077039 /usr/lib/rstudio/lib/libQt5DBus.so.5
rstudio 28221 greg 162r REG 8,5 657840 23077044 /usr/lib/rstudio/lib/libQt5PrintSupport.so.5
rstudio 28221 greg 163r REG 8,5 428328 23077056 /usr/lib/rstudio/lib/libQt5WebEngineWidgets.so.5