*** This bug is a duplicate of bug 1925010 ***
https://bugs.launchpad.net/bugs/1925010
without details on what machine you're installing on, it's impossible to
know if this is LP: #1925010 or a different bug. However, we did
specifically block release upgrades from 20.10 to 21.04 in the release
upgrader because there were known issues with 21.04 on older machines.
Marking this as a duplicate of 1925010.
** This bug has been marked a duplicate of bug 1925010
shim-signed 15.4 does not boot on EFI 1.10 systems
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https://bugs.launchpad.net/bugs/1926961
Title:
Failure to install Ubuntu 21.04 upgrade on computers with low UEFI
models (circa 2012
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