I've just found this:
<<
Important: Over the next few weeks, Launchpad is generating keys for each PPA.
While this is happening, one of two things will happen when you install
software from a PPA:
* Ubuntu will warn you that the package is unsigned.
* Ubuntu will tell you that it can't verify the key used to sign the
package. Visit the PPA's overview page to confirm the key's fingerprint and
then continue if you are happy that the package is correctly signed.
In either case you should be happy that you trust the author of the package.
Neither Launchpad nor Ubuntu check the suitability of software packaged in PPAs.
>>
Source:
https://help.launchpad.net/Packaging/PPA#Adding%20a%20PPA%20to%20your%20Ubuntu%20repositories
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Menu doesn't display some French accents
https://bugs.launchpad.net/bugs/289229
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