Issue you cannot install Ubuntu tweak or some other program which requires “colord” because “colord” is broken.

Fix:
Open a terminal

 sudo ldconfig
 sudo dpkg -r colord
 sudo apt-get check
 sudo apt-get update
 sudo apt-get upgrade --fix-missing

If his doesn’t work, further steps to try:

http://journalxtra.com/linuxsanity/fixing-the-dreaded-errors-were-encountered-while-processing-errors-1495/

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