I just tried running the installation on a Thinkpad T61p, which doesn't trigger this bug.
However I noticed the language selection dialog at the beginning of the installation, which I didn't see when I installed on the Lifebook yesterday, so it seems that it is this page that causes Ubiquity to go into the 100% mode.
However the "language pack installation isn't complete" message still popped up after installation.
I just tried running the installation on a Thinkpad T61p, which doesn't trigger this bug.
However I noticed the language selection dialog at the beginning of the installation, which I didn't see when I installed on the Lifebook yesterday, so it seems that it is this page that causes Ubiquity to go into the 100% mode.
However the "language pack installation isn't complete" message still popped up after installation.