📖 ~1 min read
Table of contents
Symptom & Impact
System appears hung on boot because disk unlock prompt is not visible on console.
Environment & Reproduction
Ubuntu 24.04 encrypted installations after graphics or initramfs package changes.
Root Cause Analysis
Plymouth or initramfs hook issues suppress prompt rendering before root mount.
Quick Triage
Switch to alternate TTY and test whether passphrase input is still accepted.
Press Esc during boot; try entering passphrase blindlyStep-by-Step Diagnosis
Boot from recovery media and inspect crypttab plus initramfs contents for missing crypt modules.
sudo cat /etc/crypttab; lsinitramfs /boot/initrd.img-$(uname -r) | grep crypt
Solution – Primary Fix
Reinstall cryptsetup and plymouth components, then rebuild initramfs and grub config.
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sudo apt install --reinstall cryptsetup-initramfs plymouth && sudo update-initramfs -u -k all && sudo update-grub
Solution – Alternative Approaches
Disable splash for text prompt visibility by editing GRUB_CMDLINE_LINUX_DEFAULT.
Verification & Acceptance Criteria
Unlock prompt appears consistently and system boots to target run level.
Rollback Plan
Revert grub cmdline and restore prior initramfs from known good backup.
Prevention & Hardening
Test encrypted boot after kernel/initramfs updates on staging hardware.
Related Errors & Cross-Refs
Related to initramfs busybox drops and cryptroot target timeout issues.
Related tutorial: View the step-by-step tutorial for Ubuntu 24.04 LTS.
View all Ubuntu 24.04 LTS tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
cryptsetup, initramfs-tools, and Ubuntu full-disk encryption docs.
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