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Debian packages

Repository key not available

Keys sometimes expire!

Err:2 http://ftp.it.debian.org/debian testing InRelease
Le seguenti firme non sono state verificate perché la chiave pubblica non è disponibile: NO_PUBKEY 9D6D8F6BC857C906

With Debian, it's possible to get a new key just using the command

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys KEY_SIG

for example

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 9D6D8F6BC857C906

Cannot upgrade or remove a very old package?

Use the commands:
cd /var/cache/apt/archives     #to enter the directory with all deb archives

dpkg -D777 -r ARCHIVENAME  #to remove a package, with debug information

dpkg -D777 -i ARCHIVENAME-version-arch.deb  #to install it

With these commands you can know exactly where is the problem. Often, the info file for the old archive does not longer exist, so you have to edit the script file (for example /var/lib/dpkg/info/coreutils.prerm ) adding || true to bypass the error (for example install-info --remove INFOFILE || true )

Postfix + Amavis + Spamassassin + Dovecot

Is postfix very slow to process a huge mail queue?

  • Check that virus scanning is not too slow. If it's slow, don't use clamscan (very slow) but prefer clamdscan (clamav-daemon): it requires a lots of memory but it's much more faster than clamscan!
  • You can also increase max_servers value on /usr/sbin/amavisd-new to get more than 2 processes for mail scanning (then, increase local smptd on port 10025 or similar, in /etc/postfix/main.cf)

 

 

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