Re comment #7, coreutils 8.24 added the ability to do "sync -f FILENAME" to sync only the file system containing FILENAME. I think update-initramfs should probably be changed to use that in xenial and newer.
Re comment #7, coreutils 8.24 added the ability to do "sync -f FILENAME" to sync only the file system containing FILENAME. I think update-initramfs should probably be changed to use that in xenial and newer.