Blog - PQ.Hosting

Feb 26, 2026

How to Change Password in Ubuntu: Own Account, Another User, and Root

The passwd command, changing root password, complexity policies via pwquality, expiration via chage, locking accounts, and resetting a forgotten password via recovery mode.

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Feb 26, 2026

Error 413 Request Entity Too Large: What It Means and How to Fix It

Error 413 occurs when an uploaded file exceeds the server limit. How to identify the source and raise the limit in Nginx, Apache, and PHP — with ready-to-use config examples.

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Feb 26, 2026

Black Screen Instead of Desktop in RDP Session: How to Fix It

Black screen on RDP connection — 6 causes and fixes: hung session, WDDM driver conflict, bitmap caching, UDP transport, and RemoteFX compression. Step-by-step guide for Windows 10 and Windows Server.

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Feb 26, 2026

How to Run a Python Script in Linux: All Methods

Running scripts via python3, shebang, virtual environments, background mode, cron, and systemd. Common errors explained — including why a script works manually but fails in cron.

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Feb 25, 2026

The mkdir Command in Linux: Creating Directories, Flags and Permissions

A practical guide to mkdir — single and nested directories, -p, -m, -v flags, brace expansion, permissions, and common errors. With real-world examples.

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Feb 25, 2026

The nc (netcat) Command in Linux: What It Does and How to Use It

A practical guide to nc — port checking, file transfer, banner grabbing, and remote shell. GNU vs OpenBSD netcat differences, common errors, and a quick reference table.

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Feb 25, 2026

Restoring GRUB After Windows 10 Installation: BIOS and UEFI Guide

Windows 10 overwrites the bootloader on install — GRUB disappears and Linux won't start. Step-by-step recovery for both BIOS/MBR and UEFI/GPT systems, including the bcdedit method without a Live USB.

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Feb 25, 2026

Searching Files by Content in Linux: grep and Beyond

"Find the file where this string is mentioned" — the task comes up constantly. Where did traffic go, where is the old domain configured, which config file has a stale database password — content search answers all of it. There are several tools available, each with its own strengths.

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Feb 24, 2026

The cd Command in Linux: Everything You Need to Know

A practical guide to cd — from basic path navigation to cd -, CDPATH, and symbolic links. With examples and common error fixes.

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