can confirm this (simpler) workaround works https://askubuntu.com/a/1335849 tested with 5.13.0
force-install the newer headers (edit out the libc6 2.33 dep in the dpkg status file)
Then just dpkg -x linux-headers-5.11.16-051116-generic_5.11.16 and replace fixdep and modpost
can confirm this (simpler) workaround works https:/ /askubuntu. com/a/1335849
tested with 5.13.0
force-install the newer headers (edit out the libc6 2.33 dep in the dpkg status file)
Then just dpkg -x linux-headers- 5.11.16- 051116- generic_ 5.11.16 and replace fixdep and modpost