non-authenticated sources

[Lila M]

hi,

while trying to install some software in ubuntu, I sometimes found myself
confronted with a warning saying:
"
Requires installation of untrusted packages: The action would require the
installation of packages from not authenticated sources."

is there any risk from installing such software although it comes with
ubuntu (i.e. it is available in the Ubuntu Software Center, but it is not
yet installed)

thanks
Lila
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