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This question already has an answer here:

I upgraded to 17.04 but having some issue with wifi, how can I downgrade to 16.04?

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marked as duplicate by edwinksl, Kevin Bowen, karel, Rinzwind, fossfreedom♦ Sep 4 '17 at 6:46

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  • Have you managed to run a full sudo apt update && sudo apt full-upgrade? That fixes at least one of the 17.04 image WiFi bugs. The other one is this one – Zanna Sep 4 '17 at 6:32
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    "having some issue with wifi: So fix that: find the chipset, google chipset for issues and solutions. – Rinzwind Sep 4 '17 at 6:37
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You cannot downgrade the ubuntu version. You'll have to reinstall 16.04. The only solution is to re-install Ubuntu 16.04 and erase 17.04, so that you have a clean installation.

Just backup your relevant files, and run the installation CD/DVD/USB.

Erase Ubuntu 17.04 and install 16.04.

https://help.ubuntu.com/community/UbuntuReinstallation

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