Hi,
I can see in the logs this error message several times:
debconf: DbDriver config: /var/cache/debconf/config.dat is locked by another
process: Resource temporarily unavailable
This might be due to bug 349469. As a workaround, I suggest you to try this:
Using the command line, run:
fuser
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https://bugs.launchpad.net/bugs/821047
Title:
package exim4-config 4.71-3ubuntu1.3 failed to install/upgrade:
subprocesul s-a instalat scriptul post-installation