Public bug reported:

After performing the last update, I followed the advice to restart the 
computer. Then it got into
a loop. After typing the correct password, the screen went 'ploink' and 
presented again an
empty password field. No failsafe option was present.

Upon getting help from an expert, this expert discovered that there were many 
old 
linux kernels, all the way back to 2.6.23 en 3.13. This took a lot of time too. 
Something to do with
NVIDIA-drivers needing gcc. On starting all the init-ramdisks had to be update 
for all those kernel versions. (Says my expert.)

I have had several computers, and each time I copied the entire hard
disk of one to the next one.

The remedy was to remove all old kernel versions.

I consider this a bug. Installing a new kernel without removing old ones causes 
apparently serious problems. Ordinary users who have no idea about what is 
"under the hood" 
are seriously handicapped and not all of them have easy access to an expert who 
can fix things 
in a couple of hours. 
        
I have Ubuntu 16.04.1 LTS

apt-cache policy pkgname  yields no information.

I am not sure that have too many outdated linux kernels
is something in a specific package.

** Affects: ubuntu-docs (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1641120

Title:
  too many kernels produce start loop

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