互いに関連する未満たな依存関係を解決するには？

Linux Mintで次の問題を解決するには？

sudo apt install shim-signed
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 base-files : Conflicts: base-files:i386
 base-files:i386 : Conflicts: base-files
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.