How can I fix this message:
Fontconfig warning: "msfonts-rules.conf", line 23: Having multiple values in <test> isn't supported and may not works as expected
Edit the /etc/fonts/msfonts-rules.conf file
Find the section saying:
<match target="font">
<test name="family">
<string>Andale mono</string>
<string>Arial</string>
...
</match>
Inside the tag there is a bunch of Andale Mono etc tags. These need to be wrapped inside their own tag. So for example
<match target="font">
<test name="family">
<string>Andale Mono</string>
</test>
<test name="family">
<string>Arial</string>
</test>
...
</match>
See this thread for more detailed how to: Ubuntu forums post