Joe's questions

I am running Ubuntu 20.04. When using the Software Updater I notice that it indicates that there is a security update for the FFmpeg library available. However, the selection box is not ticked. And I am not able to get this box ticked. Thus is this software not being updated. All other indicated updates are installed without problems. See a screen shot of the Software Updater below. This is now going on for quite a while and I am wondering whether somebody knows what I should do?

I have manually uninstalled ffmpeg and then re-installed it. This did not solve the issue: the next time I run the Software Updater I get the exact same result.

EDIT 1: this is the result of running sudo apt update, followed by sudo apt list --upgradable:

libavcodec-extra/focal-updates,focal-security 7:4.2.4-1ubuntu0.1 all [upgradable from: 7:3.4.8-0ubuntu0.2] N: There are 2 additional versions. Please use the '-a' switch to see them.

The output of sudo apt list --upgradable -a is:

libavcodec-extra/focal-updates,focal-security 7:4.2.4-1ubuntu0.1 all [upgradable from: 7:3.4.8-0ubuntu0.2] libavcodec-extra/focal 7:4.2.2-1ubuntu1 all libavcodec-extra/now 7:3.4.8-0ubuntu0.2 all [installed,upgradable to: 7:4.2.4-1ubuntu0.1]

Then running sudo apt upgrade gives:

The following packages have been kept back: libavcodec-extra

I do not know why this is being kept back and not upgraded.

EDIT 2: After seeing the result listed at EDIT 1 I decide to manually remove libavcodec-extra. And then manually re-install it. Removing it worked, but re-installing failed. I got an error saying that libavcodec-extra depends on libavcodec-extra58 but that this one would not be installed. So I manually installed libavcodec-extra58. This had unexpected consequences: my installation of wine got removed, which I use to run some Windows software. After manually installing libavcodec-extra58 was I able to install libavcodec-extra. Then I had to install wine again, which also installed libavcodec-extra58.

After upgrading Ubuntu 18.04 to 20.04.1 I get the following visual artifacts on screen:

The location where the artifacts appear seems random, especially for the dark "noise like" pixel areas. The vertical green bar seems to always appear at more or less the same location.

The computer is an Intel NUC, with Intel Core i3-6100U CPU and Mesa Intel HD Graphics 520 (SKL GT2). This computer does not have a monitor attached to it. I connect to it via Remmina (VNC). The shown artifacts were not there when it ran Ubuntu 18.04. The artifacts disappear when I change the wallpaper. However, after reboot are the artifacts back again, until I again change the wallpaper. This issue is not caused by connecting remotely to the NUC: it is also visible when I temporarily connect a monitor to the NUC itself. I do not know the correct words for these artifacts. And have therefore not been able to find any solutions or hints while searching online.

How can I solve this issue?

I am using Ubuntu 18.04 and had the Dock with pinned applications on the left hand side of my monitor. Thunderbird is one of those pinned applications. When new email arrived the icon would display a red bubble with an indication of the number of unread emails. Recently I changed my monitor setup and as a result I moved the Dock from the left hand to the bottom side of the monitor. I now notice that this red bubble does not appear any longer. Each time when I want to check for new email I have to open Thunderbird and look at the inbox. Having to do this multiple times per day is inconvenient.

How can I get this "unread email" notification working again?

This issue appeared after upgrading from Ubuntu 16.04 to 18.04.

I have an Intel NUC6i3SYH installed as a headless server on my local network. It has no display and no keyboard attached to it. I control it from my desktop computer, using Remmina. This worked fine when Ubuntu 16.04 was installed on the NUC.

I have now upgraded the NUC to Ubuntu 18.04.01. Suddenly Remmina does not work as intended any more: it can connect to the NUC and asks for the password to get access. But then it only shows a black screen. Remmina only works if I connect a display to the NUC at the time of booting. As long as the NUC senses a display does it provides graphics to Remmina. The graphics in Remmina freeze when removing the display. What do I need to do to have graphics visible in Remmina without having a display connected to the NUC?

Some technical specs about the NUC: NUC6i3SYH, CPU: i3-6100U (formerly called Skylake), using integrated graphics Intel HD Graphics 520.