添加模式以显示分辨率设置

Question

我的 vmware 机器中有 Ubuntu 16.04.6 和 Ubuntu 18.04.2。

Ubuntu 16 中的分辨率很好：

1440x2560     60.00*+
2560x1600     59.99  
1920x1440     60.00  
1856x1392     60.00  
1792x1344     60.00  
1920x1200     59.88  
1600x1200     60.00  
1680x1050     59.95  
1400x1050     59.98  
1280x1024     60.02  
1440x900      59.89  
1280x960      60.00  
1360x768      60.02  
1280x800      59.81  
1152x864      75.00  
1280x768      59.87  
1024x768      60.00  
800x600       60.32  
640x480       59.94  

Ubuntu 18 中的分辨率错误：

   800x600       60.00*+  60.32  
   2560x1600     59.99  
   1920x1440     60.00  
   1856x1392     60.00  
   1792x1344     60.00  
   1920x1200     59.88  
   1600x1200     60.00  
   1680x1050     59.95  
   1400x1050     59.98  
   1280x1024     60.02  
   1440x900      59.89  
   1280x960      60.00  
   1360x768      60.02  
   1280x800      59.81  
   1152x864      75.00  
   1280x768      59.87  
   1024x768      60.00  
   640x480       59.94  

为什么 Ubuntu 18 没有模式1440x2560？如何解决？