[issue21215] build-deps instructions for Ubuntu

[Roundup Robot]

Roundup Robot added the comment:

New changeset 84ccbb961f26 by R David Murray in branch 'default':
#21215: update debian/ubuntu build-dep instructions.
http://hg.python.org/devguide/rev/84ccbb961f26

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nosy: +python-dev

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<http://bugs.python.org/issue21215>
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