### Make a bootable Windows USB from Linux

Ubuntu has already an application called Startup Disk Creator, but this can only be used to make Linux bootable USB drives. To make a Windows bootable USB there is an application called WinUSB but it hasn't been updated for a while.
The following guide has been updated and works on any Linux distribution as long as it has GRUB and GParted installed and can make bootable USB for any Windows version newer than Vista: Windows Vista, Windows 7, Windows 8, Windows 8.1 and Windows 10. UEFI boot is only supported for Windows 7 x64 and newer.
Before starting, let's mention that there are two types of boot methods. There is the MBR code type where the bootable executable is stored in a reserved section at the beginning of the storage device. And there is the EFI type, where the boot loader executable file is stored at a standard path in an FAT32 filesystem.
You must decide in advance what you will use. There are some variables for each boot type. If you have no idea what to use, the most common setup that works with unmodified Windows sources, is msdos partition table with fat32 filesystem and flag the partition with boot. In this way you will get both an MBR and UEFI bootable drive.

### Change DPI in Ubuntu

By default Ubuntu assumes you use a 96 DPI monitor. But nowadays pixel density keeps increasing as monitors with high resolution became accessible. There is no straightforward option in Ubuntu with Unity to change the default DPI which is considered to be 96 DPI (run in  a terminal xrdb -query). But there are two parameters which control the user interface DPI (this affects font rendering too) and font rendering only.

The parameter that controls user interface and fonts DPI is scaling-factor and the font rendering parameter is text-scaling factor. These parameters can be modified by the Displays application, by GNOME Tweak Tool and by Unity Tweak Tool, but none of these allows you to set a value with 3-4 decimals.

### Computer PSU start circuit with bicolor LED

There are a lot of tutorials on the internet on how to turn a computer PSU into a bench top power supply. Most of them involve adding a load on the 5V line and turning the PSU on by grounding the PS_ON wire via a switch. Here is a nice indicator and turn on/off switch for computer PSUs.

ATX PSUs work well under rather constant loads. So if you power up the PSU with a small load of a few tens miliamps and then connect a greater load, for example a car light bulb which may require 3-4 A, the PSU may shut down. The same happens in case of an accidental shortcircuit. You may believe that the PSU got broken or its fuse got blown. That's not true. The PSU automatically shut itself off.

### Regular backups using Grive2 on Ubuntu

Grive is a Google Drive client for Linux that can do two-side synchronization between Google Drive and a local folder. The synchronization is done whenever the user launches the application, either from a launcher or from command line (it is a CLI application).

By adding grive to crontab, periodic backups of important folders can be made. And no user interaction is required because the process is automated. Here is how to do it in Ubuntu. There is no system load when the process is not running, but this comes with a disadvantage: no filesystem monitoring. Any updates are made during the automatic execution of Grive.