If it's still an issue can you please provide the output of the following
command:
fuser -v /var/cache/debconf/config.dat
Thanks.
** Changed in: debconf (Ubuntu)
Status: New => Incomplete
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package debconf failed to install/upgrade: DbDriver "config":
/var/cache/debconf/config.dat is locked by another process
https://bugs.launchpad.net/bugs/281301
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