You seem to have three different Qt versions, 32 bit Qt4 and 64 bit Qt4 and Qt5. You need a consistent set of library of one "bitness". The Qt plugin for Mysql is already present for the basic 32bit Qt4 shown in the original post. These plugins are dependent on the Mysql runtime libraries (not part of Qt) that are likely not installed by default. You can check using ldd on the Mysql Qt plugin (not the Sqlite Qt plugin).

If needed, use something like this to install the Mysql client library
Qt Code: 
  1. sudo apt-get install libmysqlclient15
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