Initrd Boot issue after update libzstd.so.1: cannot open shared object file:

After a recent update of packages, I'm unable to boot

0.794007) Loaded X.509 cert 'Canonical Ltd. Secure Boot Signing (Ubuntu Core 2019): c1d57b8f6b743f23ee41f4f7ee292f06eecadfb9'0.794402] zswap: loaded using pool izo/zbud0.795407] Key type fscrypt registered 0.795422) Key type fscrypt-provisioning registered0.795461] Key type trusted registered0.755981) Key type encrypted registered0.796005) AppArmor: AppArmor shal policy hashing enabled0.796399] integrity: Loading X.509 certificate: UEFI:MokListRT (MOKvar table)0.796548] Integrity: Loaded X.509 cert 'Canonical Ltd. Master Certificate Authority: ad91990bc22ab1f517048c23b6655a268e345a63'0.796678] Loading compiled-in module X.509 certificates0.796928) Loaded X.509 cert 'Build time autogenerated kernel key: e3d77283cb57b3f5563b4534d81b6edbb8715d48'0.796963] ima: Allocated hash algorithm: sha10.832475) ima: No architecture policies found0.832519] evm: Initialising EVM extended attributes:0.832574] evm: security.selinux0.832605] evm: security.SMACK640.832631] evm: security.SMACK64EXEC0.832662] evm: security.SMACK64TRANSMUTE0.834987] evm: security.SMACK64MMAP 0.837253] evm: security.apparmor0.838913] evm: security.ima0.840342] evm: security.capability 0.842204] evm: HMAC attrs: 0x10.843392] PM: Magic number: 8:153:5840.844513] RAS: Correctable Errors collector initialized.0.849051] Freeing unused decrypted memory: 2036K0.850548] Freeing unused kernel image (initmem) memory: 3356K0.860594] Write protecting the kernel read-only data: 30720k0.862490] Freeing unused kernel image (text/rodata gap) memory: 2036K0.863998] Freeing unused kernel image (rodata/data gap) memory: 1344K0.870106] x86/mm: Checked W+X mappings: passed, no W+X pages found.0.871201] Run /init as init processLoading, please wait.../lib/systemd/systemd-udevd: error while loading shared libraries: libzstd.so.1: cannot open shared object file: No such file or directory udevadm: error while loading shared libraries: libzstd.so.1: cannot open shared object file: No such file or directoryudevadm: error while loading shared libraries: libzstd.so.1: cannot open shared object file: No such file or directoryBegin: Loading essential drivers done.Begin: Running/scripts/init-premount done.Begin: Mounting root file system Begin: Running/scripts/local-topdone.Begin: Running/scripts/local-premount modprobe: error while loading shared libraries: libzstd.so.1: cannot open shared object file: No such file or directory /bin/btrfs: error while loading shared libraries: libzstd.so.1: cannot open shared object file: No such file or directory

I have already tried to:

• boot with the recovery option
• re-generate the initrd
• tried older kernels
• re-installed libzstd

nothing helped.

What can I do?