I am dual booting Ubuntu 20.04 installed with a dedicated home and swap partition. I encrypted both home and swap using encryptfs after install. Since then no issues or whatsoever. After running some updates today I got a warning message at boot stating that:
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).
Following the suggestion in this thread I added the option
size=256 to the content of /etc/crypttab:
cryptswap1 UUID=XXXXXXXXXXXXXXX /dev/urandom swap,offset=1024,cipher=aes-xts-plain64,size=256
Didn’t work though, the warning message at boot still persists with no noticable effect to the system.
The output of sudo cryptsetup status /dev/mapper/cryptswap1 is as following:
/dev/mapper/cryptswap1 is active and is in use. type: PLAIN cipher: aes-xts-plain64 keysize: 256 bits key location: dm-crypt device: /dev/sda4 sector size: 512 offset: 1024 sectors size: 39060480 sectors mode: read/write
I will appreciate some advice here, thanks.