I filed the following bug which may be related? https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=990867
Even though the (error) messages are/seem quite different, maybe the 'Read-only file system' message is also kernel related? I don't know the details anymore, but I've seen 'efivars' come by on the debian-kernel ML several times. Excerpt from bug #990867: Setting up shim-helpers-arm64-signed (1+15.4+6) ... Installing for arm64-efi platform. grub-install: warning: Cannot set EFI variable Boot0000. grub-install: warning: efivarfs_set_variable: failed to open /sys/firmware/efi/efivars/Boot0000-8be4df61-93ca-11d2-aa0d-00e098032b8c for writing: Read-only file system. grub-install: warning: _efi_set_variable_mode: ops->set_variable() failed: Read-only file system. grub-install: error: failed to register the EFI boot entry: Read-only file system. dpkg: error processing package shim-helpers-arm64-signed (--configure): installed shim-helpers-arm64-signed package post-installation script subprocess returned error exit status 1 dpkg: dependency problems prevent configuration of shim-signed:arm64: shim-signed:arm64 depends on shim-helpers-arm64-signed (>= 1+15.4+2); however: Package shim-helpers-arm64-signed is not configured yet. Maybe they're totally different things, but figured I'd mention it anyway.
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