Hello my friends! First of all, thank you for amazing work on "Deepin-desktop-community-25.0.10". I'm using this system, and it's just so cool, but I cannot upgrade it in any way.

I've tried the following command in terminal:

sudo deepin-immutable-ctl upgrade

And I got the following message:

Fetching summary from remote default Failed to fetch summary: while fetching https://community-packages.deepin.com/deepin/immutable-repos/summary.sig: [28] Timeout was reached

I've looked up this address on the internet and there wasn't any file named "summary.sig". So it's a bit confusing to me.

I cannot use "AppCenter" or "System Settings"'s sub-menu as an alternative way of upgrading. Neither of them is working alas. It's never worked actually, since my first days of using "Deepin25". "AppCenter" doesn't even open.

So I need your help desperately. Thanks anyway. :)