Bug#979631: They just keep filling up

[積丹尼 Dan Jacobson <jidanni@jidanni.org>]

Help. The kernels just don't go away:
$  apt-show-versions -r -p '^linux-image-[0-9]+\.'
linux-image-5.10.0-1-amd64:amd64 5.10.5-1 installed: No available version in archive
linux-image-5.10.0-2-amd64:amd64 5.10.9-1 installed: No available version in archive
linux-image-5.10.0-3-amd64:amd64 5.10.13-1 installed: No available version in archive
linux-image-5.10.0-4-amd64:amd64/unstable 5.10.19-1 uptodate
linux-image-5.9.0-2-amd64:amd64 5.9.6-1 installed: No available version in archive
linux-image-5.9.0-4-amd64:amd64 5.9.11-1 installed: No available version in archive
linux-image-5.9.0-5-amd64:amd64 5.9.15-1 installed: No available version in archive