//Edited the content to add model name.
ACER Aspire E14 user here, I registered just to say that JackE's solution has worked for me. I'm a first time linux mint user and was on the verge of giving up the Linux Mint installation and just installing Windows 10 instead but upon reading this, it has finally worked for me, and I hope others who find this in their search in the future will also be able to get their Linux Mint running on their Acer Laptops as well or for any other brands for that matter!
In my case after following JackE's instructions, I got the shim_lock error when I tried to boot into Linux Mint and I found a post on reddit that says that I simply need to disable secure boot again as opposed to JackE's instructions and it worked! My Acer E 14 Laptop has life again! It has finally booted into Linux Mint!
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