I recently bought a 2011 MacBook Pro secondhand, and it already has Linux Mint installed. Since I don't know how the previous owner configured it, I'd prefer to erase the drive completely for security and start fresh while learning Linux. Is the best approach to create a bootable USB installer, boot from it, and erase the existing partitions during installation? Or is there a simpler way to clean the system without reinstalling? I'm considering Linux Mint with Cinnamon, but I'm open to beginner-friendly recommendations. Are there any MacBook-specific issues I should watch for, such as Wi-Fi, graphics, or dual-GPU support?
3 Answers
You could install another distribution alongside the existing Mint installation, but there’s no real advantage if your goal is a clean system. Back up anything you need, boot the installer USB, select manual partitioning only if you understand it, and otherwise use the installer’s erase-and-install option. Debian is another solid choice, but Mint is generally easier for a first Linux installation.
Mint should be a reasonable choice for a beginner, and Cinnamon is a familiar desktop. During installation, enable the option for third-party or proprietary drivers if it appears; older Mac hardware sometimes needs those for Wi-Fi or graphics. Test the live USB first so you can check whether the display, wireless network, keyboard, and trackpad work before erasing anything.
A clean reinstall is the simplest and safest option here. Download the ISO from the distribution’s official site, verify it if possible, write it to a USB drive, boot the MacBook from the USB, and choose the option to erase the disk and install Linux. That removes the previous installation and gives you a known-clean starting point.

Definitely test the live environment first. Some older MacBooks have switchable graphics or Nvidia hardware that can be troublesome under Linux, so checking compatibility before installing can save you a lot of frustration.