X11 connection rejected because of wrong authentication when using sudo
I have a headless server and a desktop client, both running XUbuntu 20.04. I log in to the server using 'ssh -X servername' Graphical applicatio...
04 Apr 2026 1 READS
Slow internet with Ubuntu 20.04 and Realtek rtl8723be
I had issues with my internet connection after upgrading to Ubuntu 20.04. The current situation is as follows: If I connect my computer to the main wifi (...
04 Apr 2026 1 READS
get rid of software raid
We are running software raid1 using MDADM on ubuntu 11.04. What's the best way to get rid of it Keeping the current system ? I want to use hardware r...
04 Apr 2026 1 READS
Common chord of two circles
Find length of the common chord of two circles of radii 15 cm and 20 cm, distance between the centers being 25cm. I applied the formula $\frac{2r_1r_2}{d}...
04 Apr 2026 1 READS
Definition of "identical in distribution"
While one can find various online references (and in books) for the definition of "convergence in distribution", I have several times today been stumped (...
04 Apr 2026 0 READS
Fingerprint GUI not installing in Ubuntu 20.04
I'm trying to install fingerprint-gui on my Lenovo Ideapad 520 having Ubuntu 20.04 on which fingerprint isn't working for now. I tried going dir...
04 Apr 2026 0 READS
USB camera is not detected anymore
I have a USB camera which used to work just fine, as plug-and-play, on my Ubuntu (current version 18.04.4 LTS, Linux E480 4.15.0-88-generic #88-Ubuntu SMP...
04 Apr 2026 0 READS
How to compare two lines in a txt file with bash?
I would like to compare the two last lines from the txt file. While it looks like comparing line by line is out there - found few examples - I cant seem t...
04 Apr 2026 0 READS
Finding the associated unit eigenvector
Background Find the eigenvalues $λ_1<λ_2$ and two associated unit eigenvectors of the symmetric matrix $$A = \begin{bmatrix}-7&12\\12&11\end{bm...
04 Apr 2026 0 READS
Extended Euclidean Algorithm for Modular Inverse
I'm currently learning how to find the inverse of a modulo with the Extended Euclid Algorithm and I stumbled upon a problem when finding an inverse w...
04 Apr 2026 0 READS
