How to Fix E: Could not perform immediate configuration on ‘exim4-daemon-light’.

If you get an error like:

E: Could not perform immediate configuration on 'exim4-daemon-light'. Please see man 5 apt.conf under APT::Immediate-Configure for details. (2)

,
During installing Exim with aptitude or apt-get, i.e. # apt-get install exim4-daemon-light

or

# aptitude install exim4-daemon-light

This is due to some kind of mess with other mail server packages (sendmail or postfix) previously installed on the host and some mess with mail servers installed on system, to solve it remove all SMTP server packages sendmail / postfix / exim and then after being sure all SMTP packages are purged from system from clean install Exim light SMTP variant: # apt-get update
# apt-get -f install
# apt-get --purge remove sendmail sendmail-bin
# dpkg --force-all -r postfix
# dpkg --purge exim4-base
# dpkg --purge exim4-config
# dpkg --purge exim4-daemon-light
# apt-get update
# apt-get -f install
# apt-get install exim4-base exim4-config exim4-daemon-light

 

 

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