chippy@minushi:~$ sudo apt-get upgrade
Password:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be upgraded:
  compiz-core
1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0B/178kB of archives.
After unpacking 32.8kB of additional disk space will be used.
Do you want to continue [Y/n]?
WARNING: The following packages cannot be authenticated!
  compiz-core
Install these packages without verification [y/N]? y
(Reading database ... 110760 files and directories currently installed.)
Preparing to replace compiz-core 1:0.3.3-0ubuntu2~git2006112~edgy1 (using .../compiz-core_1%3a0.3.6-0gandalfn11_i386.deb) ...
/var/lib/dpkg/info/compiz-core.prerm: 6: gconf-schemas: not found
dpkg: warning - old pre-removal script returned error exit status 127
dpkg - trying script from the new package instead ...
dpkg: error processing /var/cache/apt/archives/compiz-core_1%3a0.3.6-0gandalfn11_i386.deb (--unpack):
 there is no script in the new version of the package - giving up
Errors were encountered while processing:
 /var/cache/apt/archives/compiz-core_1%3a0.3.6-0gandalfn11_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)