This bug still exists in the latest Ubuntu 22.04 Live image. When I
netboot the image and apply another lower layer (NFS-based), I still
get "nfs rpc call returned error 13" in my dmesg. Intensive google
searching lead me to this thread. This bug causes the Firefox (provided
via snap) not functional.
My kernel args look like this:
initrd=initrd nfsroot=${nfs-linux-boot}/kubuntu2204 netboot=nfs boot=casper
ip=dhcp mitigations=off utc=no ignore_uuid
My solution was to append "apparmor=0" to the kernel args to fully
disable the AppArmor. Now snap and firefox work again. I believe this is
not the best solution.
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https://bugs.launchpad.net/bugs/1784499
Title:
AppArmor treats regular NFS file access as network op
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