Violations of the source version uniqueness rule in the Ubuntu primary archive (apport is certainly creative):

 archive |            name             |          version           |                                                        array_agg                                                         
---------+-----------------------------+----------------------------+--------------------------------------------------------------------------------------------------------------------------
       1 | apache2                     | 2.2.8-1ubuntu0.4           | {365510,370076}
       1 | apport                      | 0.36                       | {135051,135052,135053,135054,135055,135056,135057,135058,135059,135060,135061,135062,135063,135064,135065,135066,135067}
       1 | compiz-plugins              | 0.5-0ubuntu4               | {121017,121018}
       1 | cowbell                     | 0.2.6.2-0ubuntu1           | {94928,94932}
       1 | ebtables                    | 2.0.6-3ubuntu1             | {96416,96418}
       1 | eog                         | 2.14.2-0ubuntu1            | {103582,103600}
       1 | ffmpeg                      | 3:0.cvs20070307-5ubuntu7.2 | {373961,291349}
       1 | gtksourceview               | 1.6.1-0ubuntu2             | {97583,97586}
       1 | guml                        | 0.3                        | {82734,107244}
       1 | hal                         | 0.5.7-1ubuntu9             | {96078,96079}
       1 | hotkey-setup                | 0.1-15build1               | {96014,96015}
       1 | hplip                       | 2.7.7.dfsg.1-0ubuntu5.1    | {328647,175617}
       1 | htcheck                     | 1:1.2.3-2ubuntu1           | {100880,100881}
       1 | initramfs-tools             | 0.40ubuntu26               | {95928,95929}
       1 | jokosher                    | 0.1-0ubuntu1               | {112286,112122}
       1 | knapster2                   | 0.5-7                      | {111412,111489}
       1 | ktorrent                    | 2.0.2-0ubuntu2             | {121035,121046}
       1 | language-pack-gnome-qu-base | 1:6.10+20060924            | {120109,119750}
       1 | language-pack-kab-base      | 1:6.10+20060924            | {120161,119802}
       1 | language-pack-kde-kab-base  | 1:6.10+20060924            | {120208,119849}
       1 | language-pack-kde-tlh-base  | 1:6.10+20060924            | {119899,120258}
       1 | language-pack-qu-base       | 1:6.10+20060924            | {120305,119946}
       1 | language-selector           | 0.1.26                     | {121062,121049}
       1 | libapache-authznetldap-perl | 0.07-4                     | {323988,77504}
       1 | libnjb                      | 2.2.4-3                    | {95919,95918}
       1 | libwnck                     | 2.14.2-0ubuntu1            | {103584,103588}
       1 | murasaki                    | 0.8.11-3                   | {84935,107431}
       1 | penguintv                   | 1.02-0ubuntu3              | {100549,100548}
       1 | premail                     | 0.46-9                     | {65744,262421}
       1 | telepathy-feed              | 0.11-0ubuntu1              | {112081,112082}
       1 | ubuntu-meta                 | 0.110                      | {97971,97963}
       1 | udev                        | 079-0ubuntu9               | {93112,93113}
       1 | vtk                         | 5.0.2-4build1              | {135722,135724}
       1 | wine-doc                    | 0.9-1                      | {107589,86507}
       1 | wxwidgets2.6                | 2.6.3.2.1.5ubuntu2         | {135725,135727}
       1 | xen-3.0                     | 3.0.3-0ubuntu2             | {135730,135729}
       1 | xfcalendar                  | 4.2.3-1                    | {107597,86661}
       1 | xfce4-systray               | 4.2.3-1                    | {107604,86673}
       1 | xfce4-toys                  | 4.2.3-1                    | {107605,86675}
       1 | xine-lib                    | 1.1.2-2ubuntu2             | {111909,111908}
       1 | xkeysw                      | 1.1-1.3ubuntu2             | {135732,135733}
       1 | xmldiff                     | 0.6.8-2build1              | {135737,135736}
       1 | zope-cmfactionicons         | 1:0.9-4                    | {107627,91240}
       1 | zope-i18nfolder             | 2.02-3                     | {107628,91253}
       1 | zope-i18nlayer              | 0.5.7-3                    | {91254,107629}
       1 | zope-zaaplugins             | 2.21-5                     | {107632,91266}
       1 | zope-zattachmentattribute   | 2.21-5                     | {107633,91267}
(47 rows)