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

(Reading database ... 160102 files and directories currently installed.)

Preparing to replace mysql-server-5.5 5.5.27-0ubuntu2 (using .../mysql-server-5.5_5.5.27-0ubuntu2_amd64.deb) ...

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

dpkg: error processing /var/cache/apt/archives/mysql-server-5.5_5.5.27-0ubuntu2_amd64.deb (--unpack):

 subprocess new pre-installation script returned error exit status 1

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

dpkg: error while cleaning up:

 subprocess new post-removal script returned error exit status 1

Errors were encountered while processing:

 /var/cache/apt/archives/mysql-server-5.5_5.5.27-0ubuntu2_amd64.deb

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