acer: Enable SD card reading

To activate the SD card reader on a laptop running Ubuntu:
1 – Back up your module file:
sudo cp /etc/modules /etc/modules.bak

2 – Edit the module file and add the « tifm_sd » module at the end of the file
sudo gedit /etc/modules or sudo vi /etc/modules

3 – Restart the machine or activate modules:
sudo modprobe tifm_sd

Version context

This procedure describes the software and the environment available at the time of its publication. The packages, interfaces, and repositories mentioned may have changed or disappeared; first check the system version and its support level.

cat /etc/os-release
uname -r

Work on a backup or a snapshot, note every modified file, and prepare for rollback. For a current workstation or server, prefer signed packages from officially supported repositories.

Reference: official Ubuntu lifecycle.