When I try to install Ubuntu 20.04 on my Dell Inspiron 5558 laptop, I get can't open /dev/sr0: No medium found error when GRUB tries to load "Install Ubuntu 20.04".
I have seen similar kind of problem with Ubuntu 11.04 in this post: How do I fix “can't open /dev/sr0: No medium found” on USB boot?. But that didn't work for Ubuntu 20.04: in fact, I tried pressing F6 and my PC automatically checked some information and I was able to install Ubuntu 20.04 at first. But when I restarted my PC after installing, it still had that booting problem issue and pressing F6 didn't work then. Also txt.cfg file of Ubuntu 20.04 doesn't match with Ubuntu 11.04.
I have also tried using other Linux Distro ISO files, re-downloading the ISO files, changing my installation medium (pen drive), changing BIOS/UEFI boot mode and also resetting the CMOS to hard reset the BIOS, but none of those worked for me and I figured out that the problem is with my ISO file. But, I don't know how to solve this issue.
Previously, I have installed Ubuntu 18.04 in this same PC without any problem. But suddenly Ubuntu 18.04 installation also gives the same kind of error message (this also happens with other Linux Distros).
My PC was manufactured with Ubuntu as default OS, so I shouldn't get this type of error (but I don't know why I am getting this error). I will have to go back to Windows if this issue doesn't get solved because I can install Windows on my PC without any problem.
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