@Danp Thanks for the hint, of course I didn't check the documentation 
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For updates I use a script "xo-update.sh" from https://github.com/Jarli01/xenorchestra_updater.git . There it only checks if "node -v" is equal to "node -lts", which does not work and recommends to run "sudo n lts".
Posts
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RE: Pools don't appear under Settings > Servers on fresh build of XOposted in Xen Orchestra
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RE: Pools don't appear under Settings > Servers on fresh build of XOposted in Xen Orchestra
@olivierlambert in Debian 12 it is 20.9.0 ...
Output the latest LTS Node.js version available
> n --lts
20.9.0cat /etc/debian_version
12.2