Cannot use uppercase letters for host name

[BodgeMaster]

Just ran into this while installing LMDE 5. Also, the message when entering a host name ending with a dash is wrong. It says "This field contains invalid characters" instead of something like "Host names cannot start or end with a dash".

[mtwebster]

Hostnames are defined as case-insensitive, but this is only reliable in DNS/network situations. Local programs don't always respect this, so it's recommended that they be kept lower case.

Your second point is valid - it was done this way due to time constraints prior to the release (translations take a bit of time). I'll add it so if we re-do the iso it gets included.

[mtwebster]

I made it allow uppercase in hostnames after all since it was allowed in previous editions and mainline Mint. There's also a better explanation now for invalid leading and trailing characters.