Symptoms
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Cannot switch from Postfix to QMail with the following error:
PLESK_INFO: E: Unmet dependencies. Try ‘apt-get -f install’ with no packages (or specify a solution). —X— `apt-get` output ———————
Reading package lists…
Building dependency tree…
Reading state information…
You might want to run ‘apt-get -f install’ to correct these:
The following packages have unmet dependencies:
plesk-mail-pc-driver : Conflicts: psa-mail-driver
Conflicts: psa-qmail but 3:1.03-debian8.0.build1700161026.19 is to be installed
plesk-mail-qc-driver : Depends: psa-qmail-rblsmtpd but it is not going to be installed
Conflicts: postfix but 2.11.3-1+deb8u2 is to be installed
Conflicts: psa-mail-driver
postfix : Conflicts: mail-transport-agent
psa-qmail : Conflicts: mail-transport-agent
———————- `apt-get` output —X— -
Execution of
apt-get -f install
PLESK_INFO: Removing postfix-pcre (2.11.3-1+deb8u2) …
/var/lib/dpkg/info/postfix-pcre.prerm: 18: .: Can’t open /usr/share/postfix/postinst.functions
dpkg: error processing package postfix-pcre (–remove):
subprocess installed pre-removal script returned error exit status 2
/var/lib/dpkg/info/postfix-pcre.postinst: 25: .: Can’t open /usr/share/postfix/postinst.functions
dpkg: error while cleaning up:
subprocess installed post-installation script returned error exit status 2
Errors were encountered while processing:
postfix-pcre
E: Sub-process /usr/bin/dpkg returned an error code (1) -
SpamAssasin component is present in the server:
# plesk installer –select-release-current –show-components | grep spam
…
Detecting installed product components.
spamassassin [up2date] – SpamAssassin
Cause
This behavior is caused by a bug in the product with ID #PPPM-10498 which will be fixed in future Plesk updates
Note: Consider subscribing to this article to be notified when the bug is resolved
Resolution
To fix it when this happens, the following can be performed:
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Connect to the server via SSH
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Execute the commands below:
# mkdir -p /usr/share/postfix/ && echo ‘delmap() { :; }’ > /usr/share/postfix/postinst.functions
# apt-get install -f
# rm -rf /usr/share/postfix
# /opt/psa/bootstrapper/pp17.8.11-bootstrapper/bootstrapper.sh post-install mail-qc-driver
# /opt/psa/bootstrapper/pp17.8.11-bootstrapper/bootstrapper.sh perform-deferred-actions
# rm /var/lock/parallels-panel-upgrade-failure.flag
# plesk installer remove –components postfix
# plesk installer update –repatch -
If SpamAssassin component is still needed, install it with the following command:
# plesk installer add –components spamassassin
Note: In order to avoid this problem when switching from Postfix to Qmail while SpamAssassin component is installed, the steps below should be performed:
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Connect to the server via SSH
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Execute the commands below:
# plesk installer remove –components spamassassin
# plesk installer add –components qmail
# plesk installer add –components spamassassin
with