Public bug reported:

On focal with -proposed repo enabled. Updated all packages and rebooted.
Upon entering the LUKS passphrase for disk decryption I get the
following message, and cannot boot:

  "libgcc_s.so.1 must be installed for pthread_cancel to work"

Booting with the previous kernel works.

Found this question with an identical issue:
https://askubuntu.com/questions/1190687/ubuntu-19-10-missing-lib-gcc-
so-1-after-kernel-update, which points to "/usr/share/initramfs-
tools/hooks/cryptroot" being unable to find that lib. It was looking in
"/lib/x86_64-linux-gnu/", but libgcc_s.so.1 is not there, but at
"/usr/lib/" and "/usr/lib/x86_64-linux-gnu/". Temporarily fixed by
copying the file to "/lib/x86_64-linux-gnu/" and regenerating the
initramdisk.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: libgcc1 1:10-20200202-1ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-13.16-generic 5.4.16
Uname: Linux 5.4.0-13-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset 
nvidia
ApportVersion: 2.20.11-0ubuntu16
Architecture: amd64
CurrentDesktop: KDE
Date: Tue Feb  4 00:05:48 2020
InstallationDate: Installed on 2019-09-23 (133 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Alpha amd64 (20190917)
SourcePackage: gcc-10
UpgradeStatus: Upgraded to focal on 2020-01-24 (10 days ago)

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1861757

Title:
  Missing libgcc_s.so.1 booting from encrypted partition

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