When I try to download some software from Ubuntu center or from Synaptic, I get package operation failed...
How to fix this?
edit:
I tried to install this game:
This is the details from the installation:
installArchives() failed: Selecting previously deselected package libbulletml0d2.
(Reading database ... 100%
(Reading database ... 239257 files and directories currently installed.)
Unpacking libbulletml0d2 (from .../libbulletml0d2_0.0.6-4_i386.deb) ...
Selecting previously deselected package tumiki-fighters-data.
Unpacking tumiki-fighters-data (from .../tumiki-fighters-data_0.2.dfsg1-4_all.deb) ...
Selecting previously deselected package tumiki-fighters.
Unpacking tumiki-fighters (from .../tumiki-fighters_0.2.dfsg1-4_i386.deb) ...
Processing triggers for bamfdaemon ...
Rebuilding /usr/share/applications/bamf.index...
Processing triggers for desktop-file-utils ...
Processing triggers for python-gmenu ...
Rebuilding /usr/share/applications/desktop.en_US.UTF8.cache...
Processing triggers for menu ...
Processing triggers for man-db ...
Processing triggers for python-support ...
Setting up plymouth-theme-mib-ubuntu (0.5.0-2) ...
update-alternatives: error: alternative path /lib/plymouth/themes/MIB-Ubuntu/MIB-Ubuntu.plymouth doesn't exist.
dpkg: error processing plymouth-theme-mib-ubuntu (--configure):
subprocess installed post-installation script returned error exit status 2
Setting up libbulletml0d2 (0.0.6-4) ...
Setting up tumiki-fighters-data (0.2.dfsg1-4) ...
Setting up tumiki-fighters (0.2.dfsg1-4) ...
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place
Processing triggers for menu ...
Errors were encountered while processing:
plymouth-theme-mib-ubuntu
Setting up plymouth-theme-mib-ubuntu (0.5.0-2) ...
update-alternatives: error: alternative path /lib/plymouth/themes/MIB-Ubuntu/MIB-Ubuntu.plymouth doesn't exist.
dpkg: error processing plymouth-theme-mib-ubuntu (--configure):
subprocess installed post-installation script returned error exit status 2
plymouth-theme-mib-ubuntu