I had Ubuntu 19.04 64 bit virtual machine I upgraded it to 19.10. After the upgrade finished the virtual machine has stuck on boot in VMware workstation 15. I had used a vmdk image for 19.04 available here www dot osboxes dot org slash Ubuntu (less than 10 reputation can not post more than 8 links so have to keep it that way)

I made a couple of videos while I was upgrading the virtual machine ( I followed the instructions here www dot liquidweb dot com/kb/troubleshooting-please-install-available-updates-release-upgrading/) The videos are as follows

Ubuntu 19.04 to 19.10 upgrade messages

Part 1: https://youtu.be/la-kwFYGl14
Part 2: https://youtu.be/U_j-aQRMGW4
Part 3: https://youtu.be/80OPkahASmQ
Part 4: https://youtu.be/nPSo-7daCuQ

Now what could be the problem here as why a fresh upgrade is not able to boot into a system. What should I check in here or do to fix this? This is a fresh upgrade and what ever kept happening I let it happen. I logged in to tty6 I get following screenshot. I have not restarted the system since the upgrade from 19.04 to 19.10 kept happening.

Then while I posted this question here I some how was able to restart the system and now I get

end kernel panic not syncing :VFS: Unable to mount root fs on unknown block (0,0)

Here is a video for the same. Now I don't know what should I do. Why this problem came. How to debug this and fix this. Rather than creating a new VM by downloading a new ISO I am more interested to learn and fix the problem which has caused this.

Part 5: https://youtu.be/JhFJEj2dUOM
I seem to have figured out something which might be applicable as mentioned at Kernel Panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) the thing is before upgrading I did not note down on a paper or pencil as which kernel version was running or to what version the upgrade took place. I have been running defaults only so it should not be a problem. Someone in comments mentioned

"On my ubuntu 19.10 I've had to run apt install initramfs-tools in order to get update-initramfs command –" How can I execute these commands given my situation in video 5.

The thing is I do not know how to work with advanced boot menu please see the screenshots and videos I uploaded to understand my situation.

Even after booting into one of the kernels in advanced options, I get kernel panic messages.

There is some knowledge gap in my situation I probably have figured out something which I should try but I am not able to understand how to proceed from here.

Notification blocks for example tabs from browser and is very annoying overall. Mouse works fine and will most likely continue working over a month, and battery is really simple to swap. Therefore there is no good reason to keep that notification appearing constantly and a good reason to disable it.

I have tried this answer, no help.

I also tried disable all notifications, no help.

I tried command gconftool --set /apps/gnome-power-manager/notify/low_capacity --type boolean false, no help

I have booted after changing these settings.

Since the update to 18.04 from 16.04, i see top bar with date and time only on the primary screen of my notebook. On the other screens the top bar is not shown.

Another anoying thing is i see only the actual weekday and time of the day. I would like to see the whole date with time without clicking on it...

I've searched along by google but i didnt found a solution...

Background: More red / Less blue at night

To save the eyes at night, adding more red and/or subtracting blue, is becoming popular in Windows 10 (blue-light filter) and Linux; Gnome Desktop (Night Light) and Ubuntu Unity Desktop with add-ons such as Red Shift or f.lux.

I'm wondering how to accomplish the same with Ubuntu's built-in command line xrandr <monitor> --gamma 1:1:1 feature. The 1:1:1 represents percentage of red:green:blue. I presume 1 = 100%. I'm not sure if the above packages add more red (1.2:1:1) for ~20% increase or reduce blue (1:1:0.8) for ~20% decrease or both for ~40% change.

Gnome Night Light example doesn't help

According to OMG Ubuntu, within Gnome's Night Light you can use these numerical values:

• 1000 — Lowest value (super warm/red)
• 4000 — Default night light on temperature
• 5500 — Balanced night light temperature
• 6500 — Default night light off temperature
• 10000 — Highest value (super cool/blue)

To test these numerical values, how would does one translate them to override the default --gamma 1:1:1?

What xorg's documentation says

Xorg's documentation doesn't say very much about --gamma controls:

−−gamma red:green:blue

• Set the specified floating point values as gamma correction on the crtc currently attached to this output. Note that you cannot get two different values for cloned outputs (i.e.: which share the same crtc) and that switching an output to another crtc doesn’t change the crtc gamma corrections at all.

Floating decimal points will be helpful because the script I want to upgrade sets xbacklight brightness slowly once a minute over a 90 to 120 minute transition period at dawn and dusk. I want to enhance the script with both xrandr --brightness software support for external monitors and OLED built in displays and xrandr --gamma support for red light / blue light filters. Xorg doesn't say how many decimal positions are supported but I think I think I will set bc calculations should be to 3 or 4 decimal positions for readability / precision balance.

Summary

I'm hoping to mimic what "the big guys" at Microsoft and Gnome are doing with their "more red" and/or "less blue" techniques. I haven't delved into Wayland yet but answers using that system will also be appreciated as it will no doubt be a future concern.

What adjustment to --gamma 1:1:1 are appropriate for night time?

How do I move the clock to the right of the panel in Ubuntu GNOME?

In other words, I want the clock to be in the same place as in Ubuntu Unity 16.04.