I dont want to use internet everytime to install common application like vlc, etc.. Is there a site for portable apps for ubuntu ?
You just have to download the file ,then make it executable and Run it!
You could download its .DEB package file, copy it to a USB pendrive or CD, and then install at your friend's house, even if he doesnt have internet. Its as simple as double-clicking the .DEB file. It will open a windows telling you about the program, and, if all dependencies are satisfied, you can click "install". Simple as that.
But, i strongly recommend against doing so. Because:
So, get online and use Software Center at your friends. Its really worth it.
Welcome to Linux, welcome to a whole new philosophy on downloading, installing, managing and updating software. It works different than Windows. But it works a LOT better.
Just wild guessing:
You could search on the friends-PC for vlc-plugins:
You may copy the files, and call
for every xy.deb-File found. BUt I can't guarantee it will work - I hope I understood your question right.
Most of Ubuntu (Linux in general) software which has no specific (read lack) dependencies may run from your home directory (or USB stick). Several steps to follow:
a) find an archived version of software you need,
b) unarchive a software to you home folder or USB stick,
c) set 'executable' flag in properties of main executable file,
d) just run an executable.
It should be running with no complications.