Hi, This time I replaced linux-image-4.7.0-1-amd64 w/ linux-image-4.7.0-1-amd64-unsigned. Then I ran:
$ sudo aptitude purge ~c ... Purging configuration files for linux-image-4.7.0-1-amd64 (4.7.2-1+s1) ... ... rmdir: failed to remove '/lib/modules/4.7.0-1-amd64': Directory not empty ... Not only did this cause dpkg to fail, it also removed modules.alias etc. So replacing the signed kernel package with the unsigned one still causes some problems. - Felix
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