I have a full disk encryption using
ecryptfs, after upgrading to 18.10 a warning message started to appearing at boot:
cryptsetup: WARNING: Option 'size' missing in crypttab for plain dm-crypt mapping root. Please read /usr/share/doc/cryptsetup/README.initramfs and add the correct 'size' option to your crypttab(5).
From what I see at
/usr/share/doc/cryptsetup-initramfs/README.initramfs.gz I should edit
/etc/cryptsetup and set the correct size, but how should this size be calculated for my system?
This is the content of
cryptswap1 UUID=1d1XXXXXXXXXXXX /dev/urandom swap,offset=1024,cipher=aes-xts-plain64