If you have tried to change a timeout in GRUB by setting the GRUB_TIMEOUT but this doesn’t work and you still see the 30 second timeout, this may be related to the GRUB’s “recordfail” feature. If the recordfail variable is being set to true, i.e. there was a failed boot attempt (or you use LVM/UEFI […]
linux
Signing Failed: Agent Refused Operation [SOLVED]
While attempting to connect to some server over SSH, you may get the error as follows: sign_and_send_pubkey: signing failed for RSA “/home/<username>/.ssh/id_rsa” from agent: agent refused operation The “agent refused operation” error is usually caused by too open permissions on a private key file. In this short note i am showing how to fix this […]
Install Arduino IDE on Ubuntu Linux
Even though an Arduino IDE can be easily installed on Ubuntu-like Linux system using the simple apt install arduino command, the version you will can get this way will be quite old – without the latest features and complicity in getting help on the Internet. In this note i will show the recommended way of […]
Ctrl+Shift+Key Not Working – Ubuntu, Linux Mint
If you select the Ctrl + Shift combination to switch a keyboard layout in Ubuntu or Linux Mint, any other hotkeys with Ctrl + Shift + <Key> may stop working. This is a known bug in Xorg that can be fixed by applying this patch. This is a short note about how to fix the […]
BusyBox (initramfs): Ubuntu Boot Problem Fix
The “initramfs boot problem” on Ubuntu or Linux Mint is a situation when a computer does not boot up properly and instead of going straight to the login screen, drops you to the BusyBox shell with the initramfs command-line prompt. This error usually occurs when the partition containing the operating system got corrupted. Luckily this […]
What Is My Router’s IP Address (Default Gateway)
A router is a device that communicates between the Internet (or public network) and the devices in a local network (or private network). A typical home router, that usually acts as a default gateway for the local devices, can be configured using a web-based configuration page that can be accessed from a web-browser if you […]
How to Check Inode Usage in Linux
When a file or a directory is created in a Linux file system, a name and a uniq inode number is assigned to it. An inode is a data structure that contains information about a disk block location of a file or a directory and may include metadata (times of last change, access, modification), as […]
Create Swap File – Ubuntu Linux
Swap in Linux is a space on a disk drive (HDD or SSD) that is used when the amount of physical memory (RAM) tends to get full. Swap space is usually created as a dedicated swap partition during the system’s installation but it also can take the form of a swap file. As usually there […]
Swappiness in Linux (Ubuntu) – How To Change
If you execute the free -m command you may notice that the operating system can use some swap even if there is still RAM free. This behaviour is controlled by the Linux kernel parameter vm.swappiness and can be changed by setting its value from 0 to 100. The swappiness in Linux is a rate in […]
Disable Swap Permanently – Ubuntu Linux
Swap in Linux is a space on a disk drive (HDD or SSD) that is used when the amount of physical memory (RAM) tends to get full. Although it protects Linux system from getting out of memory, in certain cases it is recommended to disable swap. For example swap should be disabled on Kubernetes nodes, […]