How to find list of installed packages in Ubuntu

[Croulet]

I had purchase a laptop which comes with Ubuntu. I am not a good one in ubuntu but here I want to ask how to find the list of installed packages in the operation system. I had tried to find out some reference but does not got any exact solution. Can anyone help me to find out the list of installed application in Ubuntu. Thanks in advance.

[Devasis]

The solution here is listed for Debian based system. It will work in Ubuntu systems. I will provide you a quick way to generate a list of packages that are installed in Ubuntu. Also you can quickly reinstall them if needed. To create a list use the following command in Terminal session : dpkg –get-selections | grep -v deinstall > ubuntu-files. After executing this you will get the list of installed debs. If you want to reinstall the application back in your home directory then do this : sudo apt-get update, sudo apt-get dist-upgrade and dpkg –set-selections < ubuntu-files.

[Solomon]

Just by giving some simple commands you can get the information about the applications installed in your ubuntu computer. First to generate a list of use the code : dpkg --get-selections > installed-software. This will give a output of information from a home directory to file. Then to reinstall a some applications use : dpkg --set-selections < installed-software which must be followed by : dselect

[MrChris-]

Here to generate a list of installed software's just give the code in your terminal service. dpkg --get-selections | grep -v deinstall. If you get a big list here and you not able to locate your application then you can use grep to find the package you are looking for. For example you want to find abc package. Then give the below sample code :

$ dpkg --get-selections | grep -v deinstall| grep abc
abc install
abc-data install $