x509: certificate signed by unknown authority

I have built a Docker container with a Go application that used the Go AWS SDK. When my program tried to access an S3 bucket I got the error message RequestError: send request failedcaused by: Get https://MY_BUCKET_NAME.s3.amazonaws.com: x509: certificate signed by unknown authority To solve the problem I had to add the following line to […]

Unable to insert the virtual optical disk in an Ubuntu virtual machine

When you try to install a new version of the VirtualBox Guest Addition on an Ubuntu virtual machine you may get the error message Unable to insert the virtual optical disk C:\Program Files\Oracle\VirtualBox\VBoxGuestAdditions.iso into the machine Ubuntu 64. Could not mount the media/drive ‘C:\Program Files\Oracle\VirtualBox\VBoxGuestAdditions.iso’ (VERR_PDM_MEDIA_LOCKED). Result Code: E_FAIL (0x80004005) Component: ConsoleWrap Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed} […]

Ubuntu gets stuck in a login loop

When I rebooted my Ubuntu machine it started to repeatedly ask for the password. When I entered the correct password, the screen went black and asked for the password again. The problem was an error in the ~/.profile file. To log into the Ubuntu terminal Press the Ctrl-Alt-F3 key combination Enter the username Enter the password […]

DevOps Engineering part 1. (Ubuntu) – Install the DevOps development tools on Ubuntu

DevOps Software installation on Ubuntu There are multiple ways to install software on Ubuntu Install a .deb package from the local drive with dpkg Install the software from the internet with apt Show hidden files To be able to see hidden files in Files Start Files, In the Edit menu select Preferences, On the Views tab check […]