Hi @clahrc ,
I'm also in the dark here. I haven't seen similar issues with RStudio and Ubuntu. It seems to me like the issue is with the version of Gtk or zenity you might be using.
Did you recently install Ubuntu and did you use the standard installation with default settings and applications? Is it installed on a server or your desktop/laptop?
I would have checked the following:
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Ensure to select the correct R Studio.deb installer.
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If changed, restore the default Ubuntu theme settings.
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Use latest version of R (instructions for Ubuntu 18.04)
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Try to install the latest version of Gtk and zenity.
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Try a different desktop environment like Kubuntu (KDE), Ubuntu Mate, Xubuntu.
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If possible, try the latest version of Ubuntu. I've used the latest R Studio on Ubuntu 19.04 but not on 18.04. I'm currently using it on Kubuntu 19.10 without any problems.
Good luck!