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How to buy a SN520 M.2 2242 NVMe SSD

SDAPMUW-512G-1022 SanDisk | Mouser

In case you use Thinkpad or GPD laptops, it might help you.

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When you lost Windows Boot Manager from EFI partition

Sometimes you break your Windows Boot Manager when you set your PC to a dualboot configuration.

In some case, start-up Repair won't help you because files in EFI partition are missing.

If the Windows system partition is untouched, you can copy EFI files from the partition.

Boot with Windows 10 installation media. Choose Repair your computer. Start command prompt.

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Stop error about nouveau and start using Intel iGPU only on Fedora (and it also applies to Debian/GNU Linux)

I'm using a Thinkpad T480 with GeForce MX150 dGPU option.

After the installation, Fedora 32 raises an error notification about nouveau on every boot up.

To get rid of this, you have two choices. You can install official proprietary driver for NVIDIA GeForce GPU. The other option is disabling GeForce dGPU at all.

You can blacklist nouveau to do that.

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Scilab on Fedora

As of 2020-08-01, You can't install scilab via dnf/yum.

Can't install scilab - Discussions in English / on using Fedora - Ask Fedora

In order to use scilab, you can download tar ball from official web site.

Still you can't start scilab because of a shared library error.

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How to enter FEL mode on Lichee nano

If SPI flash isn't on the board, just remove the TF(microSD) card from the board and supply the power. It's the same if SPI flash is empty,

If your board have a SPI flash with preloaded image, pull D4(SPI CLK) down to GND. You can use the metal part of USB micro B or TF card slot as GND. Diagram is in the comment below. Thanks: @ernestp for the correction and providing a diagram.

Or you can use the special boot image [link]. Just write it to a TF card and boot.

Don't forget to remove the GND connection after entering FEL mode otherwise you will never be able to write the boot image to the SPI flash.

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TeXLive 2018 on Windows 10 2018 October Update

TL;DR

If you can't compile your TeX document because of font not found, you should install your user fonts System Wide by right-clicking the font files and selecting Install for all users.

Explanation

From Windows 10 2018 October Update (1809), font files will be installed to %USERPROFILE%/AppData/Local/Microsoft/Windows/Fonts even if you copied your fonts to C:\Windows\fonts on Explorer.

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PostScript Core Font	URW Core35	TeX Gyre	Liberation	croscore	TypeKit	Bitstream
Helvetica	Nimbus Sans	TeX Gyre Heros	Liberation Sans	Arimo	Nimbus Sans	Swiss 721
Helvetica Condensed			Liberation Sans Narrow		Nimbus Sans Condensed	Swiss 721
Times	Nimbus Roman	TeX Gyre Termes	Liberation Serif	Tinos	Nimbus Roman	Dutch 801
Courier	Nimbus Mono	TeX Gyre Cursor	Liberation Mono	Cousine	Courier

| PostScript2 Core Font | URW Core35 | TeX Gyre | Liberation | croscore | TypeKit | Bitstream | |-------------------------|--------------|-------------------|------------------------|--------

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Problem

For example, you installed OCaml 4.x.x compiler/environment via opam switch and tried to install graphics.

opam switch 4.x.x
# `opam switch create 4.x.x` if opam 2.0.0
eval `opam config env`
opam install graphics

You might encounter some errors like this.

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If you installed opam on Fedora 28, you might be surprised the fact that you can't do opam switch 4.0x.x.

On Fedora 28, sudo dnf install opam installs opam 2.0 beta (as of 2018-06-02).

Official Blog says that there are some changes to be aware of, including:

opam switch create is now needed to create new switches

Therefore, what you want to do should be like this:

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How to enable touchscreen scrolling in Firefox

Instructions

On Debian (As of 2018-05-11, Firefox 60/52ESR, Debian sid):

Add a line to .xsessionrc:

export MOZ_USE_XINPUT2=1