Ubiquity install error

ubuntu@ubuntu:~$ sudo apt-get install ubiquity
Reading package lists... Done
Building dependency tree
Reading state information... Done
ubiquity is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 327 not upgraded.
2 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue [Y/n]? y
debconf: DbDriver "config": /var/cache/debconf/config.dat is locked by another process: Resource temporarily unavailable
Setting up apt (0.8.16~exp12ubuntu10.2) ...
gpg: key 437D05B5: "Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>" not changed
gpg: key FBB75451: "Ubuntu CD Image Automatic Signing Key <cdimage@ubuntu.com>" not changed
gpg: Total number processed: 2
gpg:              unchanged: 2
Setting up man-db (2.6.1-2) ...
debconf: DbDriver "config": /var/cache/debconf/config.dat is locked by another process: Resource temporarily unavailable
dpkg: error processing man-db (--configure):
 subprocess installed post-installation script returned error exit status 1
E: Sub-process /usr/bin/dpkg returned an error code (1)
http://pastebin.com/cqiiHZYm