Answers.

This article from Linux Format addresses various questions and issues related to Linux and open source software. The first question discusses an error message that occurs when opening XLSX sheets in LibreOffice, suggesting that it is likely a compatibility issue between Excel and LibreOffice. The second question addresses the use of SSH keys and suggests using Ssh-agent to send the passphrase of the SSH key. The third question deals with a missing toolbar in K3b and suggests using Ctrl+M to toggle it back. The fourth question discusses the disappearance of files in the /sys/class/backlight/ folder after a Ubuntu update and suggests trying different kernel options and installing the brightnessctl package. The final question addresses the annoyance of having to log in frequently due to disk encryption in Linux Mint and suggests using suspend instead of powering down to reduce the number of password requests. The article concludes by encouraging readers to send in their questions for assistance. [Extracted from the article]