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I'm trying out the xenial nightly, and I'm wondering if I have to download a new nightly once in a while to keep up to date, or if running sudo apt-get dist-upgrade will keep me current.

marked as duplicate by muru, karel, George Udosen, Charles Green, ravery Feb 10 '18 at 14:23

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To stay current, you must update and then dist-upgrade:

sudo apt-get update && sudo apt-get dist-upgrade

This will allow you to update all packages, possibly installing new ones and removing obsolete ones, for the currently installed release of Ubuntu.

If you already have the latest installed version of Ubuntu and would like to directly upgrade to the development release instead of installing nightlies, you can use:

sudo update-manager -d

Which will check if a development release is available, and ask if you'd like to upgrade to it. Going back is significantly harder if at all possible, so take a backup if you'd like that option.

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