Wrong file permissions after installation

[Alessio Brancolini]

OS: Linux Mint 17.2 "Rafaela" Cinnamon 64-bit

Problem: several files, which in my opinion should be owned by root.root, are instead owned by my the account with uid=1001.

Here is a list of these files.

/etc/firefox-3.0
/etc/firefox-3.0/pref
/etc/firefox-3.0/pref/apturl.js
/usr/bin/apturl
/usr/bin/apturl-gtk
/usr/lib/python2.6
/usr/lib/python2.7/dist-packages/gtk-2.0/sexy.so
/usr/share/pyshared-data
/usr/share/pyshared-data/apturl
/usr/share/pyshared-data/apturl-common
/usr/share/apturl
/usr/share/apturl/apturl.glade
/usr/share/kde4/services
/usr/share/kde4/services/apt+http.protocol
/usr/share/kde4/services/apt.protocol
/usr/share/pyshared
/usr/share/pyshared/AptUrl
/usr/share/pyshared/AptUrl/Parser.py
/usr/share/pyshared/AptUrl/Helpers.py
/usr/share/pyshared/AptUrl/gtk
/usr/share/pyshared/AptUrl/gtk/__init__.py
/usr/share/pyshared/AptUrl/gtk/GtkUI.py
/usr/share/pyshared/AptUrl/UI.py
/usr/share/pyshared/AptUrl/AptUrl.py
/usr/share/pyshared/AptUrl/__init__.py
/usr/share/pyshared/AptUrl/Version.py
/usr/share/pyshared/apturl-0.4.1ubuntu4.egg-info
/usr/share/firefox
/usr/share/firefox/defaults
/usr/share/firefox/defaults/pref
/usr/share/firefox/defaults/pref/apturl.js
/usr/share/doc/apturl
/usr/share/doc/apturl/changelog.gz
/usr/share/doc/apturl/copyright
/usr/share/doc/python-sexy
/usr/share/doc/python-sexy/changelog.gz
/usr/share/doc/python-sexy/NEWS.gz
/usr/share/doc/python-sexy/changelog.Debian.gz
/usr/share/doc/python-sexy/README
/usr/share/doc/python-sexy/copyright
/usr/share/doc/apturl-common
/usr/share/doc/apturl-common/changelog.gz
/usr/share/doc/apturl-common/copyright
/usr/share/man/man8/apturl.8.gz
/usr/share/man/man8/apturl-gtk.8.gz
/usr/share/pygtk/2.0/defs/sexy.defs
/usr/share/gconf/schemas/apturl.schemas
/usr/share/omf/apturl
/var/lib/dpkg/info/apturl*

This problem was discovered running "find / -user <the name of the user with uid=1001".