I’ve upgraded Ubuntu to 14.04 LTS.
At first, the time wasn’t synchronized with the Internet, though it had been set to “Automatically from the Internet” in “Time & Date” in “Systems Settings”. After an hour or so, it’ll be fine.
However, the display of monospaced fonts in some places is strange. For example, when I view the source code of a web page in Chromium, the font isn’ monospaced.
I won’t try to fix the problem since I think that metric spaces are more interesting than technical problems.
(Last edited on AUG 17, 2014)
I have now worked out a solution to this problem. Refer to Ubuntu 14.04 Monospaced Font Family for details.