关于Ubuntu Pycharm图标问号的解决方法：
1.sudo rm /usr/share/applications/jetbrains-pycharm.desktop
2.rm ~/.local/share/applications/jetbrains-pycharm.desktop
3.打开pycharm,选择tools菜单–Create Desktop Entry…，在弹出的对话框打上勾，点OK
4.cp /usr/share/applications/jetbrains-pycharm.desktop ~/.local/share/applications
问题解决…