Bug#1099474: colord: On update dpkg colord exits with fatal: The user `colord' already exists, but is not a system user. Exiting.

[Sebastian Bremicker]

Hi Petter,

> I ran into this too.  I got around it by removing the user before doing the upgrade.
> # deluser colord

thanks, this workaround helped me and the user has been re-created using 
the same settings during the package upgrade.

The actual discussion seems to take place in #1099470 so my report could 
be closed as duplicate.

Kind regards

Sebastian