I have installed Debian 9.1 (amd64) with KDE 5.8.6 from CD yesterday.
Since then, I have installed the following software from the Debian repositories:
Firefox ESR 52.3.0 & Adblock Plus 2.7.3+dfsg-1
Thunderbird 52.2.1 & Lightning 5.4.2.1
VLC Media Player 2.2.6 Umbrella
aptitude
Software Properties GTK (uninstalled again)
In addition I have installed 2 Appearance add-ons from Mozilla:
Dark Fox (using Firefox for the install)
TT DeepDark (using Thunderbird for the install)
My /etc/apt/sources.list originally looked like this:
Code: Select all
# deb cdrom:[Debian GNU/Linux 9.1.0 _Stretch_ - Official amd64 xfce-CD Binary-1 20170722-11:29]/ stretch main
deb http://ftp.de.debian.org/debian/ stretch main
deb-src http://ftp.de.debian.org/debian/ stretch main
deb http://ftp.de.debian.org/debian/ stretch-updates main
deb-src http://ftp.de.debian.org/debian/ stretch-updates main
deb http://security.debian.org/debian-security stretch/updates main
deb-src http://security.debian.org/debian-security stretch/updates main
deb http://ftp.de.debian.org/debian/ stretch main contrib non-free
deb-src http://ftp.de.debian.org/debian/ stretch main contrib non-free
deb http://ftp.de.debian.org/debian/ stretch-updates main contrib non-free
deb-src http://ftp.de.debian.org/debian/ stretch-updates main contrib non-free
deb http://security.debian.org/debian-security stretch/updates main contrib non-free
deb-src http://security.debian.org/debian-security stretch/updates main contrib non-free
I aborted the update and edited my sources.list, eliminating the entries containing 'contrib non-free'.
Accordingly, my etc/apt/sources.list is now
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# deb cdrom:[Debian GNU/Linux 9.1.0 _Stretch_ - Official amd64 xfce-CD Binary-1 20170722-11:29]/ stretch main
deb http://ftp.de.debian.org/debian/ stretch main
deb-src http://ftp.de.debian.org/debian/ stretch main
deb http://ftp.de.debian.org/debian/ stretch-updates main
deb-src http://ftp.de.debian.org/debian/ stretch-updates main
deb http://security.debian.org/debian-security stretch/updates main
deb-src http://security.debian.org/debian-security stretch/updates main
Again I cancelled the update ... wondering how packages from the Debian servers (and only 'main' packages at that) could be unsigned and possibly harmful.
Unfortunately I have not been able to find a solution perusing the Debian Wiki and searching with Google. Neither have I seen a thread in this forum which dealt with the problem.
What have I missed, or what am I doing wrongly?
Or should I simply ignore the warning and proceed with the update? (That doesn't sound like such a good idea.)
Cheers,
Gaius