problem in installing AVAST antivirus

I know this does not solve the problem, but do you know that (unless you have a server running) you do not need any antivirus program in linux? There are no viruses for linux. Only if you have a server you could use antivirus to filter Windows viruses so your users are not affected.

Ok but I am having Xp on same computer. In ubuntu 9.10 avast was working.

That it worked in 9.10 and now it doesn't is bad. I'm sorry I can't help you with that. Can anyone else here?

Still, it doesn't matter that you have XP on the same computer. You only need anti-virus protection whenever you actually USE your installation of XP. Whenever you use Ubuntu there is no virus that could attack you in any way because the virus is not able to execute in Ubuntu. There could only be the risk that you pass on a virus to OTHERS. For e.g. you receive an email which contains a virus and you forward intentionally this email to someone else without knowing that it contains a virus. But this is really extremely unlikely because 99% of the viruses come in strange emails you would recognise as suspicious or use vulnerabilities of XP or other versions of Windows.

So when you use Ubuntu your safe without any antivirus software.

Now I want to uninstall avast antivirus. how to uninstall it.

how do u install it
if using .deb, go to synaptic package manager an untick it
if using ubuntu software manager, go to there and remove
if using terminal, its a bit tricky
sudo apt-ger remove ( the name u install)

I installed with .deb package

Please search installed avast deb packages name using this terminal command

dpkg -l | grep -i ^ii | grep -i avast

then remove them with

sudo apt-get --purge remove avast ... ...
sudo apt-get autoremove

Hope this helps