Comment 3 for bug 1916517

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trombka (trombka) wrote :

I had a similar issue after upgrading to 21.04.
Package linux-headers-<version> silently failed to build these config files due to lack of packages flex and bison.

sudo apt install flex bison
sudo dpkg-reconfigure linux-headers-<version>

solved the problem, although the build still fails, but in a later stage.