This is neither an issue with aptitude nor a bug:
As the output says, "zfsutils : Conflicts: zfs-fuse", but libguestfs-tools depends on libguestfs0 which depends on zfs-fuse.
So zfsutils and libguestfs-tools can't be installed at the same time. Which is exactly what aptitude argued about.
Closing as invalid.
This is neither an issue with aptitude nor a bug:
As the output says, "zfsutils : Conflicts: zfs-fuse", but libguestfs-tools depends on libguestfs0 which depends on zfs-fuse.
So zfsutils and libguestfs-tools can't be installed at the same time. Which is exactly what aptitude argued about.
Closing as invalid.