Originally Posted by Schturman

BenDover - clean backup file can be downloaded from first post (9.5) or from Tweak C (9.5.2). I still not updated first post...

Rabah_vip - a few solutions:
0. read about this tweak in pdf/wiki
1. reboot and try again
or
2. wait 3-5 minutes and try again
or
3. run as root:

Code:

pkill pkgmgrd
rm /var/lib/dpkg/lock

and try again...