I never installed it and it's not really needed. I do remember that when I tried to installed the same packages when I tried Mint the first time, that it also marked some packages for removal which were "standard" Mint packages. I don't think the Ubuntu-restricted package is required since Mint does have all the needed/required multimedia packages installed by default.
ASUS P5KPL-AM SE*Intel Core2 Quad CPU Q8200*4 GiB ram*nVidia GeForce 9500GT*Realtek RTL8101/8102E*RaLink RT2500 802.11g*Optiarc DVD-RW AD-7200A*HDD:Samsung HD501LJ/HD103SI*Sitecom X5-N600 Router*Mint 15
Copy.com I don't need Google, my wife knows everthing!