Ubuntu

Warning message about cryptsetup during boot

Asked by Mathieu Dubois

I have noticed that since upgrade to 20.04.1 (from 18.04), a warning message appears during boot: "cryptsetup: WARNING: Option 'size' missing in crypttab for plain dm-crypt mapping cryptswap1. Please read /usr/share/doc/cryptsetup-initramfs/README.initramfs.gz and add the correct 'size' option to your crypttab(5).".

AFAICT, there is no problem however. I use ecryptfs to encrypt my home directory but I don't think it's related (since the message are related to swap). This message used to appear during updates but I never paid attention to it.

Others have reported the problem (https://askubuntu.com/questions/1109463). It seems that before 20.04, just editing /etc/crypttab was enough but some users say that they need to manually regenerate the initramfs image after each update.

For now, I'm not sure it's a bug. Any advice ? Should I edit the /etc/crypttab ? With which value ? Do I need to regenerate the initramfs image after each update (in which cas it's probably a bug) ?

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Bernard Stafford (bernard010) said : 		#2

I advise filling a Bug Report. Terminal: ubuntu-bug linux
This starts Apport and will automatically generate info added to your bug report.
Did you open and read the file?
I am enclosing the Manpage for cryptsetup
http://manpages.ubuntu.com/manpages/focal/man8/cryptsetup.8.html#see%20also
https://gitlab.com/cryptsetup/cryptsetup/wikis/FrequentlyAskedQuestions

It might be asking for the number of 512 bite sectors of the device. Due to it is an Open Action.

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Bernard Stafford (bernard010) said : 		#3

Type "O" 512 byte sectors

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Bernard Stafford (bernard010) said : 		#4

https://medium.com/@anirudha/fixing-cryptsetup-wating-for-encrypted-source-device-swapfile-error-on-linux-boot-ubuntu-20-04-5483e0dcf9e9

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Mathieu Dubois (duboismathieu-gaas) said : 		#5

Thanks for your answer and sorry for the long delay.

My laptop boots without problem. AFAICT the medium.com link you send describes the same workaround than https://askubuntu.com/questions/1109463 which has to be redone after every kernel upgrade.

I don't understand the end of your first comment and your second comment. I guess you suggest to read the man page and the FAQ but I don't understand most of their content.

Anyway, I have opened a bug report (see Bug #1903920).

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