i get onto Ubuntu Software Center and try too download

"gISOMount"

and i get a message like this

The installation could have failed because of an error in the corresponding software package or it was cancelled in an unfriendly way. You have to repair this before you can install or remove any further software.

is this something i should be worried about, can i fix this.

No, you need not be. The source of the problem would be interesting to know, but from that description it's difficult to say--it could be a broken package, but it could just as well be something else. However if the installation stopped, apt might (and probably will) notify you that you ought to "fix things" next time you're trying to do something with it (package management actions). In that case it probably gives you a command to run, for example
or something like that. Follow the instructions and you ought to be fine.

If you want, run apt-get from a terminal and see what it says. First update your package lists,
then try to install something, for example
I'm not sure if fortune-mod is installed by default, but I assume it's not (it's a program that spits out some "funny" messages when run). If it installs fine, you can remove it, or if it doesn't, you should get instructions on how to fix the package manager problems caused by the interrupted installation you mentioned. Fortune-mod itself has nothing to do with this problem, but it serves as a means to investigate apt's state, and might give you a wisdom or two at the end of these affairs

drew@drew-laptop:~$ sudo apt-get install fortune-mod
[sudo] password for drew:
E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.
drew@drew-laptop:~$ sudo dpkg --configure -a
drew@drew-laptop:~$ sudo apt-get install fortune-mod
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run `apt-get -f install' to correct these:
The following packages have unmet dependencies:
fortune-mod: Depends: librecode0 (>= 3.6) but it is not going to be installed
Depends: fortunes-min but it is not going to be installed or
fortune-cookie-db
sun-java6-jre: Depends: sun-java6-bin (>= 6.20dlj-1ubuntu3) but it is not going to be installed or
ia32-sun-java6-bin (>= 6.20dlj-1ubuntu3) but it is not installable
Recommends: gsfonts-x11 but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

If I remember right, it is easier to do

sudo mount -o loop my.iso /home/<username>/<new-folder>

.. than it is to use a tool like gISOMount.
..

Yesterday there was a chap who could surf, but could not update Ubuntu, it spit out a cannot connect to mirrors error, I wonder if there is a common issue here.

http://ubuntuforums.org/showthread.php?t=1486951 :

sudo add-apt-repository "deb http://archive.canonical.com/ lucid partner"
sudo apt-get update
.. Then all sun-java6* will be available.
..

Well, you don't really need to satisfy those dependencies; as I mentioned in my earlier post, fortune-mod was only a way to check how apt is feeling (this way you found out that apt wanted you to run "dpkg --configure -a" which you did!) So, if you don't want to add the (unnecessary) package(s) to your system, simply don't add them (= don't try to install fortune-mod anymore, unless you specifically want to). If you haven't got problems with Java, you maybe don't want to go further and install the sun-java6-* packages; don't fix it if it ain't broken.

Yes. I remember my microsoft days when I needed to run an ISO mounter because the OS does not provide any to do that job.

But here in Linux it is just a matter of one loop

# mount -o loop -t iso9660 /location/image.iso /mount/point

You can even add an entry in /etc/fstab if it's a regular name and location and you want to do that as a user. In ubuntu you'd probably need to prefix that with sudo. Could be other filesystems depending on the image, so -t auto which is probably the default anyway.

Otherwise fix your package manager. Could be no network. Could be a faulty DNS. Could be a mirror down. Could be an interrupted upgrade (power failure, it happens). Could be a corrupted file in /var/lib/dpkg/, I've had that happen BITD with debian. Power failure, corrupted file system, /var/lib/dpkg/available moved to lost+found. I just copied available.old to available and all was well again. After running the usual update stuff to ensure everything was current of course.