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Currently I use Vivid( Ubuntu 15.04 ) and I want to upgrade it to Xenial ( Ubuntu 16.04 ), I know I should invoke do-release-upgrade but if I invoke that will my files and softwares ( for example gcc 6.1.0 ) be intact or they will be cleaned?

Ehsan
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  • Does this answer your question? [Will upgrading Ubuntu remove installed software?](https://askubuntu.com/questions/788592/will-upgrading-ubuntu-remove-installed-software) – muru Jun 12 '21 at 16:08

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No. An upgrade (as done by the Software Updater app or through do-release-upgrade) is an in-place upgrade, meaning that all it will do is update software to the latest version.

In short, your files shall be untouched, and your software and Ubuntu version upgraded.