When I was installing several programs from the Ubuntu Software Center, I installed several of them in a row; for some, I was asked to provide my password; for others, I wasn't. When I removed them, the same programs that needed a password for installation, needed a password for removal; the others didn't. Why is that?
I thought I needed to provide my password each time I make any changes. If not, doesn't my system become insecure? Many thanks!