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debconf: DbDriver "config": /var/cache/debconf/config.dat is locked by another process: Resource temporarily unavailable

(Reading database ... 279774 files and directories currently installed.)

Removing virtualbox-4.2 ...

debconf: DbDriver "config": /var/cache/debconf/config.dat is locked by another process: Resource temporarily unavailable

dpkg: error processing virtualbox-4.2 (--remove):

 subprocess installed pre-removal script returned error exit status 1

Processing triggers for python-central ...

Errors were encountered while processing:

 virtualbox-4.2

E: Sub-process /usr/bin/dpkg returned an error code (1)