after upgrading to 20.04, my encrypted disk doesn't get decrypted on boot. I'm not asked for any password, so it obviously can't find any partition and boots into initrd prompt.

What might be the reason: /cryptroot/crypttab in the initrd image is completely empty.

I can open luks manually and chroot into the system. This is the content of my /etc/crypttab in the real root directory:

nvme0n1p3_crypt UUID=<some uuid> none luks

(The UUIDs are all correct, everywhere)

When I run update-initramfs -c -k all, the output is:

cryptsetup: WARNING: target 'nvme0n1p3_crypt' not found in /etc/crypttab

Which is a bit weird, because it's exactly the target name of the only single entry in that file. It's also listed in /dev/mapper as a link to ../dm-0 which also seems to be correct.

I tried renaming the device to crypt only using dmsetup rename ... but that didn't help of course.

I assume that this is the root cause of my problem.

I am trying to update a process used to remaster the Ubuntu 18.04 install image for 20.04 and running into a problem with extracting the initrd archive. The command used is cpio -id --no-absolute-filenames. When I use this same command to extract the initrd image from the 20.04 image, it extracts kernel/x86/microcode/AuthenticAMD.bin and stops.

Inspecting initrd file contents I can see a "TRAILER" section showing that there are multiple archives in the file. As suggested in other threads about cpio archives, I tried to extract the compound archive as such: cat initrd | while cpio -id --no-absolute-filenames; do :; done. In this case, the first entry extracts but then it has a bunch of "0 blocks" and doesn't extract anything else.

Does anyone know how this archive was created or how to extract it?

Here are the contents of /boot:

drwxr-xr-x  5 root root     3072 Apr 18 09:10 .
drwxr-xr-x 26 root root     4096 Mar 22 15:43 ..
-rw-r--r--  1 root root   217495 Jan 17 05:59 config-4.15.0-76-generic
-rw-r--r--  1 root root   217457 Feb 28 02:45 config-4.15.0-91-generic
drwxr-xr-x  3 root root     4096 Dec 31  1969 efi
drwxr-xr-x  5 root root     1024 Mar 22 15:50 grub
-rw-r--r--  1 root root 60196828 Apr 18 09:05 initrd.img-4.15.0-76-generic
-rw-r--r--  1 root root 60206115 Apr 18 09:05 initrd.img-4.15.0-91-generic
drwx------  2 root root    12288 Feb 13  2016 lost+found
-rw-r--r--  1 root root   182704 Jan 28  2016 memtest86+.bin
-rw-r--r--  1 root root   184380 Jan 28  2016 memtest86+.elf
-rw-r--r--  1 root root   184840 Jan 28  2016 memtest86+_multiboot.bin
-rw-------  1 root root  4068355 Jan 17 05:59 System.map-4.15.0-76-generic
-rw-------  1 root root  8367768 Jan 17 06:27 vmlinuz-4.15.0-76-generic
-rw-------  1 root root  8375960 Feb 28 02:51 vmlinuz-4.15.0-91-generic

My kernel version is 4.15.0-91-generic (based on uname -r).

The output of dpkg --list | grep linux-image is:

c  linux-image-4.15.0-74-generic                               4.15.0-74.84                                     amd64        Signed kernel image generic
ii  linux-image-4.15.0-76-generic                               4.15.0-76.86                                     amd64        Signed kernel image generic
ii  linux-image-4.15.0-91-generic                               4.15.0-91.92                                     amd64        Signed kernel image generic
ic  linux-image-4.4.0-171-generic                               4.4.0-171.200                                    amd64        Signed kernel image generic

This is what happens when I run sudo apt-get upgrade:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following package was automatically installed and is no longer required:
  thermald
Use 'sudo apt autoremove' to remove it.
The following packages have been kept back:
  linux-headers-generic
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
Setting up linux-firmware (1.173.17) ...
update-initramfs: Generating /boot/initrd.img-4.15.0-91-generic
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_EGL.conf: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_mirclientplatform.conf: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_mirplatformgraphics.conf: No such file or directory
update-initramfs: Generating /boot/initrd.img-4.15.0-76-generic
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_EGL.conf: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_mirclientplatform.conf: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_mirplatformgraphics.conf: No such file or directory
update-initramfs: Generating /boot/initrd.img-3.19.0-69-generic
WARNING: missing /lib/modules/3.19.0-69-generic
Ensure all necessary drivers are built into the linux image!
depmod: ERROR: could not open directory /lib/modules/3.19.0-69-generic: No such file or directory
depmod: FATAL: could not search modules: No such file or directory
depmod: WARNING: could not open /var/tmp/mkinitramfs_BapeFK/lib/modules/3.19.0-69-generic/modules.order: No such file or directory
depmod: WARNING: could not open /var/tmp/mkinitramfs_BapeFK/lib/modules/3.19.0-69-generic/modules.builtin: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_EGL.conf: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_mirclientplatform.conf: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_mirplatformgraphics.conf: No such file or directory
update-initramfs: Generating /boot/initrd.img-3.19.0-66-generic
WARNING: missing /lib/modules/3.19.0-66-generic
Ensure all necessary drivers are built into the linux image!
depmod: ERROR: could not open directory /lib/modules/3.19.0-66-generic: No such file or directory
depmod: FATAL: could not search modules: No such file or directory
depmod: WARNING: could not open /var/tmp/mkinitramfs_oFrhwW/lib/modules/3.19.0-66-generic/modules.order: No such file or directory
depmod: WARNING: could not open /var/tmp/mkinitramfs_oFrhwW/lib/modules/3.19.0-66-generic/modules.builtin: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_EGL.conf: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_mirclientplatform.conf: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_mirplatformgraphics.conf: No such file or directory
update-initramfs: Generating /boot/initrd.img-3.19.0-65-generic
WARNING: missing /lib/modules/3.19.0-65-generic
Ensure all necessary drivers are built into the linux image!
depmod: ERROR: could not open directory /lib/modules/3.19.0-65-generic: No such file or directory
depmod: FATAL: could not search modules: No such file or directory
depmod: WARNING: could not open /var/tmp/mkinitramfs_cmnh3Q/lib/modules/3.19.0-65-generic/modules.order: No such file or directory
depmod: WARNING: could not open /var/tmp/mkinitramfs_cmnh3Q/lib/modules/3.19.0-65-generic/modules.builtin: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_EGL.conf: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_mirclientplatform.conf: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_mirplatformgraphics.conf: No such file or directory
update-initramfs: Generating /boot/initrd.img-3.19.0-59-generic
WARNING: missing /lib/modules/3.19.0-59-generic
Ensure all necessary drivers are built into the linux image!
depmod: ERROR: could not open directory /lib/modules/3.19.0-59-generic: No such file or directory
depmod: FATAL: could not search modules: No such file or directory
depmod: WARNING: could not open /var/tmp/mkinitramfs_kimz35/lib/modules/3.19.0-59-generic/modules.order: No such file or directory
depmod: WARNING: could not open /var/tmp/mkinitramfs_kimz35/lib/modules/3.19.0-59-generic/modules.builtin: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_EGL.conf: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_mirclientplatform.conf: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_mirplatformgraphics.conf: No such file or directory
update-initramfs: Generating /boot/initrd.img-3.19.0-58-generic
WARNING: missing /lib/modules/3.19.0-58-generic
Ensure all necessary drivers are built into the linux image!
depmod: ERROR: could not open directory /lib/modules/3.19.0-58-generic: No such file or directory
depmod: FATAL: could not search modules: No such file or directory
depmod: WARNING: could not open /var/tmp/mkinitramfs_yH46Fl/lib/modules/3.19.0-58-generic/modules.order: No such file or directory
depmod: WARNING: could not open /var/tmp/mkinitramfs_yH46Fl/lib/modules/3.19.0-58-generic/modules.builtin: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_EGL.conf: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_mirclientplatform.conf: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_mirplatformgraphics.conf: No such file or directory
update-initramfs: Generating /boot/initrd.img-3.19.0-25-generic
WARNING: missing /lib/modules/3.19.0-25-generic
Ensure all necessary drivers are built into the linux image!
depmod: ERROR: could not open directory /lib/modules/3.19.0-25-generic: No such file or directory
depmod: FATAL: could not search modules: No such file or directory
depmod: WARNING: could not open /var/tmp/mkinitramfs_gmb7aZ/lib/modules/3.19.0-25-generic/modules.order: No such file or directory
depmod: WARNING: could not open /var/tmp/mkinitramfs_gmb7aZ/lib/modules/3.19.0-25-generic/modules.builtin: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_EGL.conf: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_mirclientplatform.conf: No such file or directory
/sbin/ldconfig.real: Warning: ignoring configuration file that cannot be opened: /etc/ld.so.conf.d/x86_64-linux-gnu_mirplatformgraphics.conf: No such file or directory

gzip: stdout: No space left on device
E: mkinitramfs failure cpio 141 gzip 1
update-initramfs: failed for /boot/initrd.img-3.19.0-25-generic with 1.
dpkg: error processing package linux-firmware (--configure):
 installed linux-firmware package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
 linux-firmware
E: Sub-process /usr/bin/dpkg returned an error code (1)

Now, the contents of /boot are:

drwxr-xr-x  5 root root     3072 Apr 18 09:14 .
drwxr-xr-x 26 root root     4096 Mar 22 15:43 ..
-rw-r--r--  1 root root   217495 Jan 17 05:59 config-4.15.0-76-generic
-rw-r--r--  1 root root   217457 Feb 28 02:45 config-4.15.0-91-generic
drwxr-xr-x  3 root root     4096 Dec 31  1969 efi
drwxr-xr-x  5 root root     1024 Mar 22 15:50 grub
-rw-r--r--  1 root root 16975438 Apr 18 09:14 initrd.img-3.19.0-58-generic
-rw-r--r--  1 root root 16975489 Apr 18 09:14 initrd.img-3.19.0-59-generic
-rw-r--r--  1 root root 16975434 Apr 18 09:14 initrd.img-3.19.0-65-generic
-rw-r--r--  1 root root 16975144 Apr 18 09:14 initrd.img-3.19.0-66-generic
-rw-r--r--  1 root root 16975428 Apr 18 09:14 initrd.img-3.19.0-69-generic
-rw-r--r--  1 root root 60195966 Apr 18 09:14 initrd.img-4.15.0-76-generic
-rw-r--r--  1 root root 60204841 Apr 18 09:14 initrd.img-4.15.0-91-generic
drwx------  2 root root    12288 Feb 13  2016 lost+found
-rw-r--r--  1 root root   182704 Jan 28  2016 memtest86+.bin
-rw-r--r--  1 root root   184380 Jan 28  2016 memtest86+.elf
-rw-r--r--  1 root root   184840 Jan 28  2016 memtest86+_multiboot.bin
-rw-------  1 root root  4068355 Jan 17 05:59 System.map-4.15.0-76-generic
-rw-------  1 root root  8367768 Jan 17 06:27 vmlinuz-4.15.0-76-generic
-rw-------  1 root root  8375960 Feb 28 02:51 vmlinuz-4.15.0-91-generic

It appears that the system is trying to build old initrd files in /boot, and then /boot fills up, and then dpkg fails. How can I fix this?

I tried to extract the initrd casper/initrd of Ubuntu 18.10 and got an unexpected result. I did not see the root filesystem and files, but just a folder named kernel.

What I have done

Firstly I tried to know if I should decompress the initrd or just extract the archive directly, so I issued this command:

$ file initrd
initrd: ASCII cpio archive (SVR4 with no CRC)

What I got

According to the output, it should be an cpio archive and I used cpio to extract the archive.

$ cpio -id < initrd 
56 blocks
$ ls
initrd  kernel

If I went to have a look of the directory kernel, I got

kernel/
└── x86
    └── microcode
        └── AuthenticAMD.bin

2 directories, 1 file

What I expect

There should be files and folders like init, etc, usr, and so on. For example:

bin  conf  cryptroot  etc  init  lib  lib64  run  sbin  scripts  usr  var

ubuntu 18.04 64-bit

I have a setup which has three separate block crypt devices, plus a non-encrypted /boot. If I had started with a clean sheet of paper, I could have done it with two, but it would be a science project to reformat everything now.

On boot, the scripts in initramfs ask for the passphrase for each separately, I would like to add my own script in which I prompt for it once, and decrypt all the drives / partitions in one shot, pre-empting the system script, and allowing me to use a more complex one that CBP can't brute force :)

I am struggling to figure out where to put it.

I have had a look at a bunch of stuff, and it talks a lot about how to run update-initramfs and the scripts executed then when generating the initrd file, but not how to add content to initramfs itself. I could manually unpack and repack the initrd file, but that is not compatible with the system tools like update-initramfs, and best case I'd have to redo it every kernel upgrade or other post-install trigger.

I was kinda hoping for a folder like init/rc3.d where I could just drop it and use a sequence number to get it executed early.