When I install I get this error

--- 2012-02-15 16:53:28 ---
Start reading package lists
--- 2012-02-15 16:53:45 ---
Finished reading package lists
--- 2012-02-15 16:53:57 ---
/usr/bin/apt-get -qsy --allow-unauthenticated -o Dir::Etc::sourcelist=/opt/fapman-cache/sources.list -o Dir::State::lists=/opt/fapman-cache/lists -o Dir::Etc::sourceparts="" --auto-remove install modified-hildon-desktop
--- 2012-02-15 16:53:57 ---
Output from last process:
---
E: Could not get lock /var/lib/dpkg/lock - open (11 Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?

--- 2012-02-15 16:54:16 ---
/usr/bin/apt-get -qsy --allow-unauthenticated -o Dir::Etc::sourcelist=/opt/fapman-cache/sources.list -o Dir::State::lists=/opt/fapman-cache/lists -o Dir::Etc::sourceparts="" --auto-remove install modified-hildon-desktop
--- 2012-02-15 16:55:11 ---
Output from last process:
---
Reading package lists...
Building dependency tree...
Reading state information...
The following NEW packages will be installed:
modified-hildon-desktop
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Inst modified-hildon-desktop (3.3 Matan:my.svgalib.org)
Conf modified-hildon-desktop (3.3 Matan:my.svgalib.org)

--- 2012-02-15 16:55:19 ---
/usr/bin/apt-get -qy --allow-unauthenticated -o DPkg:ptions::=--force-confnew -o Dir::Etc::sourcelist=/opt/fapman-cache/sources.list -o Dir::State::lists=/opt/fapman-cache/lists -o Dir::Etc::sourceparts="" --auto-remove install modified-hildon-desktop
Reading package lists...
Building dependency tree...
Reading state information...
The following NEW packages will be installed:
modified-hildon-desktop
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 220kB of archives.
After this operation, 524kB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
modified-hildon-desktop
Authentication warning overridden.
Get:1 http://my.svgalib.org ./ modified-hildon-desktop 3.3 [220kB]
Fetched 220kB in 5s (36.8kB/s)
(Reading database ... 61525 files and directories currently installed.)
Unpacking modified-hildon-desktop (from .../modified-hildon-desktop_3.3_armel.deb) ...
dpkg: error processing /var/cache/apt/archives/modified-hildon-desktop_3.3_armel.deb (--unpack):
trying to overwrite `/usr/share/gconf/schemas/hildon-desktop-keys.schemas', which is also in package hildon-desktop
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Errors were encountered while processing:
/var/cache/apt/archives/modified-hildon-desktop_3.3_armel.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

In x-terminal I get the same error with dpkg-i any solution