apt-get update && apt-get upgrade
Ign http://download.opensuse.org  InRelease
Hit http://security.debian.org jessie/updates InRelease
Ign http://ftp.debian.org stable InRelease
Hit http://ftp.debian.org jessie-updates InRelease
Get:1 http://download.opensuse.org  Release.gpg [481 B]
Hit http://ftp.debian.org stable Release.gpg
Hit http://http.debian.net jessie-backports InRelease
Get:2 http://download.opensuse.org  Release [1,004 B]
Get:3 http://ftp.debian.org jessie-updates/main i386 Packages/DiffIndex [9,868 B]
Err http://download.opensuse.org  Release

Hit http://security.debian.org jessie/updates/non-free i386 Packages
Hit http://ftp.debian.org jessie-updates/contrib i386 Packages
Get:4 http://ftp.debian.org jessie-updates/non-free i386 Packages/DiffIndex [736 B]
Ign http://mozilla.debian.net jessie-backports InRelease
Get:5 http://http.debian.net jessie-backports/main i386 Packages/DiffIndex [27.8 kB]
Hit http://ftp.debian.org jessie-updates/contrib Translation-en
Get:6 http://ftp.debian.org jessie-updates/main Translation-en/DiffIndex [3,688 B]
Get:7 http://ftp.debian.org jessie-updates/non-free Translation-en/DiffIndex [736 B]
Hit http://security.debian.org jessie/updates/non-free Translation-en
Hit http://security.debian.org jessie/updates/main i386 Packages
Hit http://security.debian.org jessie/updates/contrib i386 Packages
Ign http://mozilla.debian.net jessie-backports Release.gpg
Get:8 http://http.debian.net jessie-backports/main Translation-en/DiffIndex [27.8 kB]
Hit http://ftp.debian.org stable Release
Hit http://security.debian.org jessie/updates/contrib Translation-en
Hit http://security.debian.org jessie/updates/main Translation-en
Ign http://mozilla.debian.net jessie-backports Release
Ign http://mozilla.debian.net jessie-backports/firefox-release i386 Packages/DiffIndex
Hit http://ftp.debian.org stable/main i386 Packages
Hit http://ftp.debian.org stable/contrib i386 Packages
Hit http://ftp.debian.org stable/non-free i386 Packages
Hit http://ftp.debian.org stable/contrib Translation-en
Hit http://ftp.debian.org stable/main Translation-en
Hit http://ftp.debian.org stable/non-free Translation-en
Ign http://mozilla.debian.net jessie-backports/firefox-release Translation-en_US
Ign http://mozilla.debian.net jessie-backports/firefox-release Translation-en
Err http://mozilla.debian.net jessie-backports/firefox-release i386 Packages
  404  Not Found [IP: 149.20.4.15 80]
Fetched 72.1 kB in 4s (14.6 kB/s)
Reading package lists... Done
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://download.opensuse.org  Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 61508B60C33A8925

W: There is no public key available for the following key IDs:
EF0F382A1A7B6500
W: Failed to fetch http://download.opensuse.org/repositories/home:/Alexx2000/Debian_8.0/Release

W: Failed to fetch http://mozilla.debian.net/dists/jessie-backports/firefox-release/binary-i386/Packages  404  Not Found [IP: 149.20.4.15 80]

W: Some index files failed to download. They have been ignored, or old ones used instead.
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these.
The following packages have unmet dependencies:
 doublecmd-qt : Depends: doublecmd-common (= 0.7.2-0+svn6850~xenial) but 0.7.7-1 is installed
                Depends: doublecmd-plugins (= 0.7.2-0+svn6850~xenial) but 0.7.7-1 is installed
E: Unmet dependencies. Try using -f.