Q:

Since upgrade to 18.04 libreOffice calc no longer imports xml

Since I upgraded Ubuntu to the latest, the Data->Xml import in libreOffice Calc is greyed out and non functioning.
apt-get libreoffice reports that the latest version is installed.

A:

OK, I think I found something that might help you.  Warning:  This might cause Libreoffice Calc to be unstable.
Click on Tools -> Options -> Advanced
Then click on Enable experimental features (this may be unstable)

After clicking OK it will prompt you to restart calc.  Then Data -> XML Source should now be enabled.
Hope this helps!

