Are you using an english keyboard layout?
Background: During initial setup you choose your keyboard layout before you enter your password for encryption - BUT in the password dialog still the default keyboard layout is active and not the one you chose!
If you later type your password on a keyboard layout configured differently you might not enter the same password, before the position of keys changed.
Furthermore there is a bug in the keyboards that makes it difficult to enter some keys.
But your screenshot seems to tell a different story or at least points to additional problems. If you’d like to debug the problem you’ll probably need to look at the scripts and information inside your initramfs. This is time consuming work to do and probably only makes sense if you’re able to read shell scripts.
In your screenshot you’re at a prompt in the initramfs - a minimal linux system that is started during boot to allow the loading of drivers and initializing some things (like decrypting encrypted drives) before initd or systemd from the root partition can takeover.
To start you could look at the following files:
- /etc/crypttab
- /cryptroot/crypttab
- /bin/cryptroot-unlock
- /scripts/local-top/cryptroot
Also you could copy the initramfs file /boot/initrd.img-x.y.z-r-amd64 to a different computer and unpack the filesystem there. The file is an cpio archive compressed with gzip (zcat initrd.img-x.y.z-r-amd64 | cpio -i
would unpack it in the actual directory).