I've recently replaced my WinXP with Ubuntu 12.04 LTS (32-bit), so I'm a total Linux newbie. I have installed TeXLive and now am trying to install TeXmaker.

I get dependency errors just like in http://ubuntuforums.org/showthread.php?t=1919941, so I've subsequently tried to install Synaptic using a .deb file.

roy@roy-OEM:~$ sudo dpkg -i synaptic_0.81.1_i386.deb

[sudo] password for roy: 

Selecting previously unselected package synaptic.

(Reading database ... 138918 files and directories currently installed.)

Unpacking synaptic (from synaptic_0.81.1_i386.deb) ...

dpkg: dependency problems prevent configuration of synaptic:

 synaptic depends on libapt-inst1.5 (>= 0.8.16~exp12); however:

  Package libapt-inst1.5 is not installed.

 synaptic depends on libapt-pkg4.12 (>= 0.9.11); however:

  Version of libapt-pkg4.12 on system is 0.8.16~exp12ubuntu10.16.

 synaptic depends on libept1.4.12; however:

  Package libept1.4.12 is not installed.

 synaptic depends on libpango-1.0-0 (>= 1.14.0); however:

  Package libpango-1.0-0 is not installed.

 synaptic depends on libpangocairo-1.0-0 (>= 1.14.0); however:

  Package libpangocairo-1.0-0 is not installed.

dpkg: error processing synaptic (--install):

 dependency problems - leaving unconfigured

Processing triggers for man-db ...

Processing triggers for desktop-file-utils ...

Processing triggers for bamfdaemon ...

Rebuilding /usr/share/applications/bamf.index...

Processing triggers for gnome-menus ...

Processing triggers for hicolor-icon-theme ...

Errors were encountered while processing:

 synaptic

I'm using a .deb file from Softpedia (not a good idea?) because I haven't got an internet connection yet (I'll need to configure a dial up modem soon).

So - what exactly are these lib* packages on ubuntu.com and how can I install them correctly?