PC won't POST after enabling EXPO/XMP memory profile (AM5)
After turning on the EXPO (or XMP) memory profile in BIOS for full RAM speed, the machine won't POST -- black screen, no display,…
Fixes that actually work — because we ran them.
Most tutorials copy each other, so one wrong step spreads everywhere. Every fix here was proven by doing it, and shows you the wrong way other sites repeat — and why it fails.
BIOS / hardware
MySQL
apt installs MySQL 8.0 instead of 8.4 (and your backup won't load)
You add the official MySQL APT repository to install MySQL 8.4, but apt keeps installing Ubuntu's MySQL 8.0 instead. When you the…
Restore a raw /var/lib/mysql backup (not a .sql dump) onto a new server
Your backup is a tar of the raw /var/lib/mysql folder, not a mysqldump .sql file. You need to bring it back on a freshly installe…
The mysql-apt-config blue menu loops forever over SSH
Installing the mysql-apt-config .deb opens an interactive blue (ncurses/debconf) menu to pick the MySQL version. Over SSH it keep…
Ubuntu install
Ubuntu installer hangs / black screen on boot — use Safe Graphics
Booting the Ubuntu install USB hangs on a black screen or a frozen logo and never reaches the installer, often on machines with a…