So I bought a new Laptop half a year ago (Acer swift sf-14) with preinstalled Windows. Since my university suggests using Linux for certain things I got myself ubuntu dual boot (installed from USB) and had no problems doing so.
A few weeks ago I decided to try out some other Linux distros and found Zorin OS and installed it (also from USB).
The installer gave me the handy option to replace my ubuntu with Zorin which I selected but now that I wanted to try out a different distro (manjaro) I realized that something went wrong when installing Zorin:
In the boot menu and in the bios I can't select Boot from USB stick anymore, instead, it gives me this:
If I put the Windows Bootloader at front it starts win10 (obviously) and if I select the first ubuntu it loads Zorin OS and if I start the second Ubuntu it starts Windows, too. I'm getting kinda desperate and would be really happy if someone could help me.