apache2-mpm-worker is recommended by trac (through 'provides'):

$ apt-cache show trac | grep Recommends
Recommends: apache2 | httpd, ...
$ apt-cache show apache2-mpm-worker | grep Provides
Provides: apache2, apache2-mpm, httpd, httpd-cgi

so it is expected that having trac installed prevents apache2-mpm-worker
from being removed.  Same situation with bsd-mailx, etc.:

$ apt-cache show bsd-mailx | grep Provides
Provides: mail-reader, mailx


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

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https://bugs.launchpad.net/bugs/217585

Title:
  aptitude::Delete-Unused behaves incorrectly

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