新手求助！ubuntu15.04下Mendeley首次启动失败，跪求大神赐招！

[ys@UBT]

终端运行
yangsong@yangsong-N43SN:~$ mendeleydesktop
Using system Qt version 4.8.6 in /usr/lib/x86_64-linux-gnu
QFSFileEngine::open: No file name specified
Unable to sort by field "LastReadField"
Unable to sort by field "LastReadField"

Mendeley的UI不能跳出，启动器里面虽然有图标，但是左边的小三角变成'>'，如附件所示
如果直接点击启动器图标，也没用UI，也是左边出现个'>'

[lhw828]

不知道这是啥