PIB

VirtualBox 上で Ubuntu 20.04.1 LTS の ISO を用いて作業する際に、起動直後の解像度が 800x600 なのをいちいち、右上の「電源」アイコン→「Settings」で gnome-control-center 開いて、「Display」→Resolution「1920x1200(16:10)」みたいに選択するの面倒くさいなと。

「Ubuntu desktop resolution change command」でググったら以下のページを見つけた。

• StackExchange / ask ubuntu / 2013-04-14: How do I change the screen resolution using Ubuntu command line?

xrandr [-d <DISPLAY>] -q

で調べて

xrandr [-d <DISPLAY>] --output <OUTPUT> --mode <RESOLUTION>

で設定しろと。

ubuntu@ubuntu:~$ xrandr -q
Screen 0: minimum 1 x 1, current 1920 x 1200, maximum 8192 x 8192
Virtual1 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   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  
Virtual2 disconnected (normal left inverted right x axis y axis)
Virtual3 disconnected (normal left inverted right x axis y axis)
Virtual4 disconnected (normal left inverted right x axis y axis)
Virtual5 disconnected (normal left inverted right x axis y axis)
Virtual6 disconnected (normal left inverted right x axis y axis)
Virtual7 disconnected (normal left inverted right x axis y axis)
Virtual8 disconnected (normal left inverted right x axis y axis)

$ xrandr --output Virtual1 --mode 1920x1200

$ xrandr -d :0 -q
Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 16384 x 16384
VGA-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)
DP-1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
   2560x1440     59.95*+
   1920x1200     59.88
   1920x1080     60.00    60.00    50.00    59.94    24.00    23.98
   1920x1080i    60.00    50.00    59.94
   1600x1200     60.00
   1680x1050     59.95
   1280x1024     75.02    60.02
   1280x800      59.81
   1152x864      75.00
   1280x720      60.00    50.00    59.94
   1024x768      75.03    60.00
   800x600       75.00    60.32
   720x576       50.00
   720x480       60.00    59.94
   640x480       75.00    60.00    59.94
   720x400       70.08
HDMI-3 disconnected (normal left inverted right x axis y axis)