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I recently wanted to install Linux Mint 21.3 Cinnamon on my Lenovo Ideapad 3 and got this error message when I started the Mint installation image. Fortunately I found a thread which explained how to get rid of this message: Linux Mint Forums Just rename grubx64.efi to mmx64.efi on the second partiion of the flash drive and then the Mint installation image boots successfully.
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A nice one liner which lists which grub version is installed on which partition (Source)
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The Raspberry Pi is a nice system which is used a lot of time to provide server services to be accessible from worldwide. That's Owncloud, a HTTP server, seafile or other services..
A VPN is the right way to access the server in a secure way. But if you want to give a lot of people access there is no way other than to allow access direct from the internet. Usually you use a DMZ for this but that's a feature a normal home router doesn't have. But now you should protect the Raspberry from internet access as far as you can and also protect your home network from access from the pi server when an intruder managed to get access to the pi. But note: If an the intruder managed to get root access then the iptables firewall can be turned off very quickly. So it's very important to get SW updates on a regular base.
Following article describes how to configure an iptables firewall to protect it from unauthorized access from the internet and to protect a local home network to be attacked from the server - just in case.