The relevant error was:
Setting up ubuntu-keyring (2007.06.11) ...
gpg: symbol lookup error: /usr/local/lib/libreadline.so.5: undefined symbol: BC
gpg: symbol lookup error: /usr/local/lib/libreadline.so.5: undefined symbol: BC
dpkg: error processing ubuntu-keyring (--configure):
subprocess post-installation script returned error exit status 127
I'm closing this report because it was caused by a locally installed
version of libreadline5. Don't hesitate to submit any new bug.
** Changed in: update-manager (Ubuntu)
Status: Confirmed => Invalid
** Package changed: update-manager (Ubuntu) => ubuntu-keyring (Ubuntu)
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Dist upgrade failed while running update-initramfs
https://bugs.launchpad.net/bugs/157907
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