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I get the following error when trying to upgrade from 20.10 to 21.04:

A problem occurred during the update.
This is usually some sort of network problem,
please check your network connection and retry

I have perfect internet connection. But why does this error occur?

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    It's no longer possible to upgrade from 20.10 the normal way because 20.10 is out of support. – ChanganAuto Aug 10 '21 at 18:40
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    Does this answer your question? How to install software or upgrade from an old unsupported release?. Standard releases come out every 6 months and are supported for 9 months after release. Once support ends, the upgrade path can become more challenging because the old release no longer gets updates. If you do not want to have to upgrade every 6-9 months, use an LTS release which are supported for 5 years for Ubuntu Desktop & Ubuntu Server and 3 years for other flavors. – Nmath Aug 10 '21 at 19:11
  • You'll need to explore your main.log, apt.log & other files (https://wiki.ubuntu.com/DebuggingUpdateManager maybe helpful) to see reasons, however (1) did you ensure your groovy or 20.10 system was fully upgraded before you tried to release-upgrade as that is essential and (2) with repositories moved did you change your sources to point at the old-releases site? (removing country codes etc as you've missed the EOL window); see https://help.ubuntu.com/community/EOLUpgrades If it's a desktop system, theeasiest fix is upgrade via re-install which won't user files etc if you don't format – guiverc Aug 10 '21 at 22:44

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