Based on https://www.youtube.com/watch?v=p2-Et_3MOYE&vl=en

1. Preparations in Windows:

• disable fast boot https://www.tenforums.com/tutorials/4189-turn-off-fast-startup-windows-10-a.html
• shrink the windows partition: search command "Disk management", right-click the partition and select "shrink"

2. Preparations in BIOS (click F2 repeatedly during booting)

• system configuration -> SATA operation -> AHCI (+save)
• secure boot -> secure boot enable -> disable
• General -> Advanced boot options -> Enable legacy Option ROMs
• General -> Boot Sequence -> switch UEFI to Legacy

3. Installation (Press F12 repeatdly during boot)

• Select UEFI boot -> (name of the USB stick)
• in the boot menu -> select Install Ubuntu, but don't enter yet but press "e" to edit boot options and add "acpi=off" to the line with "linux" (which usually ends with something like "quiet splash" and press ctrl+X to save and continue
• proceed as usual. You will get the option to install linux next to windows

4. Postprocessing

• Don't forget to put BIOS setting back in General -> Boot Sequence -> switch back from Legacy to UEFI or the boot loader won't be found