[Comm] apt-get update - File was not signed with a known key

[Денис Назаров]

> > 
> > # rpmverify apt-conf-server alt-gpgkeys
> > 
> [root на localhost sources.list.d]# rpmverify apt-conf-server alt-gpgkeys
> .......T c /etc/apt/sources.list
> S.5....T c /etc/apt/sources.list.d/server.alt.list
> .......T c /etc/apt/sources.list.d/server.heanet.list
> .......T c /etc/apt/sources.list.d/server.jinr.list
> .......T c /etc/apt/sources.list.d/server.kiev.list
> .......T c /etc/apt/sources.list.d/server.yandex.list
> .......T c /etc/apt/sources.list.d/sisyphus.alt.list
> .......T c /etc/apt/sources.list.d/sisyphus.chg.list
> .......T c /etc/apt/sources.list.d/sisyphus.heanet.list
> .......T c /etc/apt/sources.list.d/sisyphus.ilim.list
> .......T c /etc/apt/sources.list.d/sisyphus.jinr.list
> .......T c /etc/apt/sources.list.d/sisyphus.kiev.list
> .......T c /etc/apt/sources.list.d/sisyphus.mobicomk.list
> .......T c /etc/apt/sources.list.d/sisyphus.psn.list
> .......T c /etc/apt/sources.list.d/sisyphus.unixcenter.list
> .......T c /etc/apt/sources.list.d/sisyphus.yandex.list
> ..5..... c /etc/apt/vendors.list
> 
> 
в общем, почитал внимательно в server.alt.list комментарии
# Signed repositories have an [keyid] tag.
# If you remove it, no digital signature check will be made!

убрал [updates]
rpm ftp://ftp.altlinux.org/pub/distributions/ALTLinux/4.0/branch i586 classic
rpm ftp://ftp.altlinux.org/pub/distributions/ALTLinux/4.0/branch noarch classic

и стало мне щастье... только вот проверки теперь нет, как я понимаю.
Для чего она нужна?