Guys I have just confirmed that this is happening on Ubuntu 16.04 daily
build 18/12 and probably on earlier builds...
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https://bugs.launchpad.net/bugs/1526029
Title:
Installer disabled
Public bug reported:
When installing Ubuntu Gnome there is a button improperly disabled in
the installer. If the options "Download updated while installing" and
"Install Third-Party Software" are both checked, the Partition dialog
will have the "Install Now" greyed out and the user will have to pr
