apt-get -f install worked once I'd remounted /boot
I guess it would be nicer to report the problem more clearly, but I've
resolved it for me.
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
package linux-image-4.4.0-89-generic (not installed) failed to
install/upgrade: unable to clean up mess surrounding
'./boot/config-4.4.0-89-generic' before installing another version:
Read-only file system
To manage notifications about this bug go to:
ubuntu-bugs mailing list