I was appending an option to /etc/sysctl.conf but I accidentally used > instead of >> so I've overwritten the whole file.
I haven't yet rebooted since it happened.
Is there any way to revert the file back to the original state? I haven't changed anything there since the installation of the OS so hopefully it would suffice to just copy a typical one after install.
I had an issue with my external HD monitor which started flickering and the rows of pixels were unaligned with each other a bit so the picture was kind of blurry. I tried everything from changing some settings to a different kernel and nothing worked.
I run Ubuntu 18.04 on dual UEFI boot with Windows 10. I have one SSD (both systems are on that one) and one HDD. After adding a brand new SSD the new SSD got assigned sda and the system booted into emergency mode.
Program plymouthd was sending SIGRTMIN (as observed by examining the journal by journalctl -xb).
After removal of the new SSD Ubuntu is working as normal. Windows 10 was not affected by this.
Is there any way to fix this problem?