I found that the 18.04.4 LTS version has longer support than the one i installed 19.10, so can i change to the former one without doing a clean installation ?

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    @karel Yes ,thank you. – DODE Feb 28 at 20:22

It is impossible to downgrade from 19.10 to 18.04.3LTS. If you really want to revert it back, backup all your data and reinstall Ubuntu to the version you want. As a reminder, you should read properly the support dates before upgrade your Ubuntu.

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