Software Installation Problems
Ubuntu's software management tools tend to operate pretty smoothly these days. Nevertheless, I've included some troubleshooting tips for two or three problems that used to be common (but seem to be getting rarer with each release). If you're having a problem with installing, removing, or updating packages, this section is for you.
I Get an Error About Unauthenticated Packages
If you get an error message about unauthenticated packages when you try to install a program, try the following:
Select System ▸ Administration ▸ Update Manager to open the Update Manager.
Click the Check button, and enter your password if prompted. The package list will be updated, along with all the files that are used to check whether your packages ...
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