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it is possible to get back to Ubuntu 20.04.1 from 20.04.3 ? I am running Petalinux 2021.1 in Ubuntu 20.04.3 and I get an issue that "This is not a supported OS"

Then I have looked at the reference guide. According to that 20.04.1 is the required OS, not 20.04.3.

https://www.xilinx.com/support/documentation/sw_manuals/xilinx2021_1/ug1144-petalinux-tools-reference-guide.pdf

abc@alpha:/$ uname -a
Linux alpha 5.4.0-88-generic #99-Ubuntu SMP Thu Sep 23 17:29:00 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
karel
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engr_john
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2 Answers2

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You cannot roll back to 20.04.1 but you can download and install the Ubuntu 20.04.1 iso file (ubuntu-20.04.1-desktop-amd64.iso) from the official Ubuntu website. You can reinstall Ubuntu without losing the data in /home even without a separate /home partition by following the instructions in the following Ubuntu documentation wikis.

karel
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You cannot as such roll back to 20.04.1, but you can rollback to the original kernel series that came with the initial Ubuntu version, if you would happen to have enabled HWE. HWE or Hardware Enablement stacks provide newer kernel and X support for existing Ubuntu LTS installations.

vanadium
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