Serial (COM port) to USB cable for old APC UPS

Firstly find and buy cable on aliexpress by keywords «APC Smart UPS DB9, CP2102, USB RS232, serial 9 D-Sub, cable 940-0024C, Windows 7/8/10, Mac, Linux».

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Mount VirtualBox vdi image (debian, ubuntu)

You can use qemu package.

apt-get install qemu

After you can check and load network block device kernel-module:

rmmod nbd
modprobe nbd max_part=8

Then you connect image:

qemu-nbd -c /dev/nbd0 image.vdi

And mount (don’t forget create mount directory /media/image):

mount /dev/nbd0p1 /media/image

And unmount:

qemu-nbd -d /dev/nbd0