Also, for completeness:
1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu Hirsute
2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center 2.03.11-2ubuntu2
3) What you expected to happen To be able to build a working initramfs to boot Ubuntu after upgrade.
4) What happened instead initramfs was missing the lvm2 binary and did not pick up my LVs after I decrypted the partition which hosted them.
Also, for completeness:
1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu
Hirsute
2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center
2.03.11-2ubuntu2
3) What you expected to happen
To be able to build a working initramfs to boot Ubuntu after upgrade.
4) What happened instead
initramfs was missing the lvm2 binary and did not pick up my LVs after I decrypted the partition which hosted them.