Linux & Unix

E: Unable to locate package

Fixing 'Unable to locate package' in apt on Ubuntu/Debian

Your apt can't find the package. Usually it's a missing repo or outdated cache. Here's how to fix it...

Beginner 👁 258 Jun 25, 2026

EMFILE: too many open files

Linux ulimit Hard Cap: When 'Too Many Open Files' Kills Your App

Your app crashes with 'too many open files' because the hard ulimit is too low. Raid the system limi...

Intermediate 👁 46 Jun 25, 2026

Dependency Hell When Installing .deb Files? Fix It Now

Stuck with dependency errors trying to install a .deb? Start with apt-get install -f, then try dpkg ...

Intermediate 👁 48 Jun 25, 2026

mount: /mnt/data: mount point is busy.

Disk Mount Race Condition – Fix in 3 Steps

A disk mount race condition happens when systemd tries to mount a drive before the disk is ready. He...

Intermediate 👁 87 Jun 25, 2026

Keyboard Brightness Keys Not Working on Linux – Fix

Brightness keys not adjusting screen? Usually a missing driver or wrong kernel module. Here's the fa...

Intermediate 👁 338 Jun 24, 2026

modprobe: FATAL: Module not found

Kernel module dependency not found after kernel update fix

This error pops up after a kernel update when the module dependencies file is stale. The fix is rebu...

Intermediate 👁 80 Jun 24, 2026

PulseAudio audio crackling? Fix it in 5 minutes

Audio crackling in PulseAudio is usually a buffer timing issue. The quick fix is to tweak the timer-...

Beginner 👁 56 Jun 24, 2026

Containerd Service Keeps Crashing – Fix It Fast

Containerd crashing? Start with checking disk space and logs. If that's clean, it's likely a config ...

Intermediate 👁 57 Jun 24, 2026

Permission denied (publickey)

Fix Git 'Permission Denied Publickey' Clone Error on Linux

You tried to clone a repo and got a publickey error. It's usually a missing SSH key or wrong remote ...

Beginner 👁 103 Jun 24, 2026

Terminal history not saving between sessions on Linux? Fix it now

Your terminal history disappears when you close the shell. Usually it's a missing .bash_history file...

Beginner 👁 61 Jun 24, 2026

Connection timed out

SSH Connection Timed Out on Linux – Quick Fix

Your SSH client says "Connection timed out" after waiting. This usually means the port is blocked, t...

Beginner 👁 34 Jun 24, 2026

VLC Codec Not Supported Fix on Linux

VLC on Linux often throws 'codec not supported' for certain video formats. This happens when package...

Beginner 👁 265 Jun 24, 2026

blk_update_request: I/O error, dev sda, sector 12345678

Fix Disk I/O Scheduler Failure on Linux (2024)

Disk I/O scheduler fails often on older kernels or NVMe drives. Quick fix: switch to 'none' schedule...

Intermediate 👁 47 Jun 24, 2026

Terminal Says 'No manual entry' for Command

Stuck with 'No manual entry' errors? Here's how to add missing man pages in Linux....

Beginner 👁 78 Jun 24, 2026

ELOOP

Too Many Levels of Symbolic Links Fix – Linux

This error happens when a symlink chain loops or breaks. The fix is finding the broken link and fixi...

Beginner 👁 63 Jun 24, 2026

Segmentation fault (core dumped)

Linux Segfault: Quick Fixes for Process Crashes

Your program crashed with a segfault. We'll show you the fastest fix first, then dig deeper if neede...

Beginner 👁 103 Jun 24, 2026

Linux OOM Killer: When Your App Gets Murdered by the Kernel

Your app dies with no error? The Linux OOM killer killed it when memory ran low. Here's the real fix...

Intermediate 👁 115 Jun 24, 2026

Linux Disk Encryption Password Prompt Missing at Boot

Your system boots straight to login without asking for the disk encryption password. It's usually a ...

Intermediate 👁 116 Jun 23, 2026

X11 server crash: fix the black screen right now

Your X11 display server crashed, leaving you on a black screen. I'll show you two quick fixes, then ...

Intermediate 👁 126 Jun 23, 2026

Fix Software Center Crashing on Search in Ubuntu 22.04

Software center crashes when you type in the search bar on Ubuntu 22.04. The problem is usually a co...

Beginner 👁 53 Jun 23, 2026

Hash Sum Mismatch

Apt-Get Hash Sum Mismatch: The Real Fixes

apt-get update fails with hash mismatches. Start with the 30-second fix, then move deeper. I'll show...

Intermediate 👁 99 Jun 23, 2026

Linux 'Operation Not Permitted' When Copying System Files

You get 'Operation Not Permitted' when copying system files like /etc/shadow or /var/log/syslog. It'...

Intermediate 👁 76 Jun 23, 2026

Temporary failure in name resolution

Fix systemd-resolved DNS failure on Linux

DNS stops resolving after systemd-resolved fails. We'll fix it by checking the stub resolver and DNS...

Beginner 👁 181 Jun 23, 2026

Failed to start Docker Application Container Engine

Docker Daemon Won't Start on Ubuntu 22.04

Docker daemon fails after a kernel update on Ubuntu 22.04. The dockerd can't bind to the socket. Fix...

Intermediate 👁 83 Jun 22, 2026