Linux Troubleshooting

The kernel killed your process. Decode ‘Out of memory: Killed process’, find what actually consumed the RAM, and stop the OOM killer striking again.

Diagnose any failed systemd service. Read exit codes, find the real error in the journal, and fix the permission, path, and dependency problems behind most failures.

Fix MySQL ‘Access denied for user root@localhost’. Understand auth_socket, reset the root password safely, and restore access without losing data.

Fix pip’s externally-managed-environment error on Ubuntu 24.04 and Debian 12. Use venv, pipx, or apt correctly instead of the flag that breaks your system.

Fix SSH ‘Permission denied (publickey)’ for good. Use verbose output to see which key was offered, then correct the permissions and paths that cause it.

GRUB rescue unknown filesystem error? Copy-paste fixes ordered by likelihood. Works on Ubuntu, Debian, Fedora. Senior engineer walkthrough.

Fix “Too many open files” errors in Linux. Check current limits with ulimit, raise file descriptors per-user and system-wide with exact commands.

Cannot open shared object file: no such file error on Linux? Copy-paste fixes ordered by likelihood. Developers and sysadmins get solutions in 5 minutes.

Fix ‘unable to locate package’ apt errors on Linux. Copy-paste commands to update repos, fix sources, and resolve missing packages in minutes.

apt broken install won’t fix? Try these 5 solutions ordered by likelihood. Copy/paste commands, exact error fixes, all Linux distros covered.