linux-base not installed but listed in /var/run/reboot-required.pkgs

[Adam Funk]

Hi,

I did an apt-get dist-upgrade yesterday, including a new kernel.  I
rebooted.  Today I'm getting the "System restart required" message.  I
googled how to find out what package triggered it, so:

$ cat /var/run/reboot-required.pkgs 
linux-base

But dpkg shows that the linux-base package is not installed!  What
gives?

Thanks.