User account management, Please Help
Hi, I'm new on Linux, well, I want to make two user accounts on my desktop, Ubuntu distribution, Yes, i know i can make two accounts simply, But i want several features, have a look :
1 : I want to make only one password for root.
2 : I want if a user installs any program, another user would be able to use it, by default.
3 : Is it possible to make one root password, and each user can put his customize password(not root password).
4 : If any other nice suggestion you have, then please give me to make user accounts, another user is my brother so i don't have any privacy problem, I can share root password, but in any case I may need to protect my user folder only, I don't want that i will install gimp and skype twice on my computer, If anyone can help, I'll be thankful.