Progress indicators are these spinning wheels, the digits progressing slowly 
from 0 to 100 (%) and all that stuff.  As the manpage says quiet level 1 
"produces output suitable for logging" thousands of lines saying
Reading package lists... 0%
Reading package lists... 0%
Reading package lists... 1%
Reading package lists... 2%
…
aren't that useful and are therefore what is disabled (=thousand of lines as 
removing previous lines isn't possible on non-tty output). One line telling 
what is currently done on the other hand is suitable for logging and useful in 
some cases.

Btw "mysql-server is already the newest version." is not an error
message. It is just an information for the user - the command keeps the
promise  "After the command packge mysql-server is installed" for the
user, that it doesn't need to do anything for it isn't an error…

** Changed in: apt (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/874409

Title:
  apt-get -q flag fails to squelch status -qq hides everything

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