How to fix VirtualBox Linux boot error: vboxadd-service.service failed.

Problem:

2023-05-25, suddenly I cannot boot my linux virtual machine with an error vboxadd-service.service failed.

My environment

Host: Windows 11
VirtualBox 7.0.6. r155176 (Qt5.15.2)
Linux kernel 5.19.0-42-generic, Kubuntu

Solution:

~~Remove the additional module. It seems this is no longer needed.~~

~~mount the VBox_GAs_7.0.6 (You need to mont VBoxGuestAdditions.iso and need to see it at /media/<username>/VBox_GAs_7.0.6/)~~
~~cd /media/<username>/VBox_GAs_7.0.6/~~
~~sudo ./VBoxLinuxAdditions.run uninstall~~

Solution (updated 2023-06-02)

The issue seemed caused by the wrong display setting. Removed VBoxLinuxAdditions makes VBoxVGA Graphics controller works, but the clipboard between host and guest didn't work. So removing the VBoxLinuxAdditions is not a solution. I have no idea why the Graphics controller setting suddenly causing a problem. But here is the solution.

Setting the Graphics controller to VMSVGA resolved the problem.
VBoxLinuxAdditional.run should be executed. Otherwise, the Bidirectional clipboard didn't work.

Comments

Why A^{T}A is invertible? (2) Linear Algebra

Why A^{T}A has the inverse Let me explain why A^{T}A has the inverse, if the columns of A are independent. First, if a matrix is n by n, and all the columns are independent, then this is a square full rank matrix. Therefore, there is the inverse. So, the problem is when A is a m by n, rectangle matrix. Strang's explanation is based on null space. Null space and column space are the fundamental of the linear algebra. This explanation is simple and clear. However, when I was a University student, I did not recall the explanation of the null space in my linear algebra class. Maybe I was careless. I regret that... Explanation based on null space This explanation is based on Strang's book. Column space and null space are the main characters. Let's start with this explanation. Assume x where x is in the null space of A . The matrices ( A^{T} A ) and A share the null space as the following: This means, if x is in the null space of A , x is also in the null spa

Gauss's quote for positive, negative, and imaginary number

Recently I watched the following great videos about imaginary numbers by Welch Labs. https://youtu.be/T647CGsuOVU?list=PLiaHhY2iBX9g6KIvZ_703G3KJXapKkNaF I like this article about naming of math by Kalid Azad. https://betterexplained.com/articles/learning-tip-idea-name/ Both articles mentioned about Gauss, who suggested to use other names of positive, negative, and imaginary numbers. Gauss wrote these names are wrong and that is one of the reason people didn't get why negative times negative is positive, or, pure positive imaginary times pure positive imaginary is negative real number. I made a few videos about explaining why -1 * -1 = +1, too. Explanation: why -1 * -1 = +1 by pattern https://youtu.be/uD7JRdAzKP8 Explanation: why -1 * -1 = +1 by climbing a mountain https://youtu.be/uD7JRdAzKP8 But actually Gauss's insight is much powerful. The original is in the Gauß, Werke, Bd. 2, S. 178 . Hätte man +1, -1, √-1) nicht positiv, negative, imaginäre (oder gar um

Why parallelogram area is |ad-bc|?

Here is my question. The area of parallelogram is the difference of these two rectangles (red rectangle - blue rectangle). This is not intuitive for me. If you also think it is not so intuitive, you might interested in my slides. I try to explain this for hight school students. Slides: A bit intuitive (for me) explanation of area of parallelogram (to my site, external link) .

Lx=d: SundayResearch

Search This Blog