mackay wrote:If the above post doesn't work, I found a hint here http://www.linuxandubuntu.com/home/kde- ... tro-review about installing the normal Ubuntu application for changing update settings and mirrors.

Open a terminal (like Konsole) and type

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sudo apt install software-properties-kde

enter your password if it asks for it, then after it installs type

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sudo software-properties-kde

That should open the application called Software Sources. On the first tab (neon Software) look for "Download from" and it will show what mirror you are using. Click the mirror and it will give you the options of "Main Server" and "Other". I would suggest trying "Other" and finding the mirror closest to you. If that mirror doesn't work, then try another mirror.