Alright, this rules out an ordinary DNS or repo issue. Since you’re hitting Cloudflare’s edge and the SSL connection itself is failing consistently, this starts to smell like either a network-level problem (your ISP or firewall) or OpenSSL hating life on this system.
A quick check for any blanket TLS issues: Let’s temporarily fall back to HTTP (non-SSL) to determine whether SSL is truly the choke point.
- Edit the source file:
sudo nano /etc/apt/sources.list.d/cubecoders.list
- Change the URL to use
http
instead ofhttps
:
deb http://cdn-repo.c7rs.com/ debian/
- Save the file and apply:
sudo apt-get update
sudo apt-get install ampinstmgr
If this works, then the culprit is some SSL/TLS server-client miscommunication. If even HTTP doesn’t work, we’ll look deeper into whether there’s some network-level funny business going on. Let me know the results!