Linux guest on Windows10 Host, installation&resolution probs

[bm0404]

Hey, I am new to VirtualBox and trying to setup a Linux guest on a Windows 10 host. The first issue I am having is with the Linux OS boot within the VM. After starting selected VM, the screen is black and reads "FATAL: No bootable system found! System halted." I selected the appropriate ISO image file in the First Time Wizard so I'm not sure why I get this error.

The second issue I have I think may be caused by Windows 10. The Linux guest opens in a new window, but the actual box showing the OS only takes up about 1/15 of my screen. Is there a way to adjust this to make it closer to full screen? I have noticed this happening with several other programs in Windows 10. Tried to upload a screenshot, but can't get a file size small enough.

Thanks for the help!

[noteirak]

After starting selected VM, the screen is black and reads "FATAL: No bootable system found! System halted." I selected the appropriate ISO image file in the First Time Wizard so I'm not sure why I get this error.

Either the ISO is actually not configured properly or the ISO is not bootable in the first place. Please read Minimum information needed for assistance and provide as a zipped attachment the VM log file and the guest settings.

Is there a way to adjust this to make it closer to full screen? I have noticed this happening with several other programs in Windows 10.

Until the guest OS is installed, the window will match the resolution inside the VM which is small but 1/15 seems pretty small. I wouldn't look further into this until you have Linux installed.