They are installed...
Code:
$ ls /home/mlunter/.wine/drive_c/windows/Fonts/Liberation*
/home/mlunter/.wine/drive_c/windows/Fonts/LiberationMono-BoldItalic.ttf
/home/mlunter/.wine/drive_c/windows/Fonts/LiberationMono-Bold.ttf
/home/mlunter/.wine/drive_c/windows/Fonts/LiberationMono-Italic.ttf
/home/mlunter/.wine/drive_c/windows/Fonts/LiberationMono-Regular.ttf
/home/mlunter/.wine/drive_c/windows/Fonts/LiberationSans-BoldItalic.ttf
/home/mlunter/.wine/drive_c/windows/Fonts/LiberationSans-Bold.ttf
/home/mlunter/.wine/drive_c/windows/Fonts/LiberationSans-Italic.ttf
/home/mlunter/.wine/drive_c/windows/Fonts/LiberationSans-Regular.ttf
/home/mlunter/.wine/drive_c/windows/Fonts/LiberationSerif-BoldItalic.ttf
/home/mlunter/.wine/drive_c/windows/Fonts/LiberationSerif-Bold.ttf
/home/mlunter/.wine/drive_c/windows/Fonts/LiberationSerif-Italic.ttf
/home/mlunter/.wine/drive_c/windows/Fonts/LiberationSerif-Regular.ttf