Демьян и вино...

Ставлю Wine по их инструкции для Демьяна:
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use the console editor by typing 'nano /etc/apt/sources.list' and then add the following lines to the end:
deb http://wine.sourceforge.net/apt/ binary/
deb-src http://wine.sourceforge.net/apt/ source/
Then, you can run 'apt-get update' to update APT's package information. Finally, to install Wine, do 'apt-get install wine'.
)

root# apt-get install wine
Reading package lists... Done
Building dependency tree... Done
Suggested packages: msttcorefonts wine-doc wine-utils binfmt-support
The following NEW packages will be installed: wine
0 upgraded, 1 newly installed, 0 to remove and 244 not upgraded.
Need to get 13,8MB of archives.
After unpacking 55,8MB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
wine
Install these packages without verification [y/N]? n
E: Some packages could not be authenticated

Вопрос: __почему__ пакеты не подписаны? Означает ли это, что они могут быть не оригинальными, т. е. подмененными? О чем это вообще говорит?