Questions[fedora](ubuntu)

I used linux for two years. I bought a new 4K Dell monitor, connected it to HDMI, booted into Windows, and it worked fine, then I booted into Ubuntu Linux and it just show no picture (the same thing happened in Elementary OS).

Then I booted into Fedora Linux and it also show no picture unless i got into settings and set it to 30 Hz (yes, I had a 60 Hz mode in it, it just did not work) - the same thing happened in Manjaro.

I could not get any picture at all in Ubuntu.

Notes:

1. I have secure boot disabled in my os because I disabled it for Manjaro installation..

2. Xorg drivers never worked for me, I always forced safe mode until I would not install Nvidia proprietary drivers..

3. I use AMD Ryzen 4th Gen mobile(laptop) processor, if it matters (I do not know how good is support for Ryzens in Linux)

I tried these solutions:

• Create an xorg mode with edid disabled and forced 60 Hz refresh rate,
• set a 60 Hz refresh rate, then I tried 54 Hz, and 50 Hz, nothing worked.

Then I just gave up after two days of trying.

I have two disks 512 and 128 and i installed fedora on 128gb and i formatted the volume next day but when I start up I can still see some parts of fedora like fedora-workstation from dev/mapper/fedora and one more option I formatted the other disk completely but the boot menu of ubuntu still shows it , How do i remove them from the Ubuntu boot menu ? Help needed. I tried the other answers from stack overflow but they weren't of much use to my situation. Here's the output of sudo efibootmgr

BootCurrent: 0001
Timeout: 0 seconds
BootOrder: 0001,2001,2002,2003
Boot0001* ubuntu
Boot2001* EFI USB Device
Boot2002* EFI DVD/CDROM
Boot2003* EFI Network

and output of sudo fdisk -l | sed -e '/Disk \/dev\/loop/,+5d'

Disk /dev/sdb: 476.96 GiB, 512110190592 bytes, 1000215216 sectors
Disk model: Micron 1100 SATA
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 91821F0B-52DB-469D-9970-E75C7B6B44E5

Device       Start        End   Sectors   Size Type
/dev/sdb1     2048    1050623   1048576   512M EFI System
/dev/sdb2  1050624 1000214527 999163904 476.4G Linux filesystem


Disk /dev/sda: 119.25 GiB, 128035676160 bytes, 250069680 sectors
Disk model: RTOTJ128VGD2EYX 
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 52492BA3-5D3F-4180-8F2B-8636EC02033E

How to set the minimum time between double clicks (two clicks)? Avoiding single click turns out to be double clicks

In Fedora, I use my preferred account name, which happens to be a fully qualified domain name. By using a fully qualified domain name as my user name across most of my accounts (both on my own computer and across the web), I minimize the chance that my usual user name is taken.

There are some services that do not allow this, due to character restrictions, and that is fine. But in Fedora, my usual name works. This is proof that GNU/Linux CAN handle user names that begin with a digit (as mine does) and contain dots. However, *buntu does not allow this, and I have to use a permutation of my name. Ignoring the outright disallowing of dots, *buntu even does fine with digits, but not at the beginning ... Strange.

Is this a problem? No, not really. I'm not looking for a solution. I just want to know WHY this is. Is this purely arbitrary, or is there some reason for these odd restrictions? Why is *buntu unable to offer as much flexibility in this area?

I have Fedora installed on my desktop and I want to make a live USB stick with Ubuntu to install it on a laptop. What's the easiest way to do it?