Comment 8 for bug 820034

It doesn't look like Ubuntu is using the "lastresort" approach to "backup" the Ubuntu font when the Ubuntu font cannot represent any particular Unicode character--

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http://unicode.org/policies/lastresortfont_eula.html
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"Overall, there are a number of advantages to using the Last Resort font for unrepresentable characters."

    "Operating systems are freed from the overhead of providing a full Unicode font."
    "Users see something more meaningful than a black box for unrepresentable characters."
    "Users familiar with the scripts being represented with the Last Resort font will readily identify what needs to be installed to represent the text."
    "Users unfamiliar with the missing scripts are shown easily-identified symbols rather than lengthy strings of unidentifiable characters."

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http://www.fileformat.info/info/unicode/block/miscellaneous_symbols_and_pictographs/fontsupport.htm
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Font Support for Unicode Block 'Miscellaneous Symbols And Pictographs'
lastresort 100%
symbola 100%
babelstone han 6%