[jonatron]

Three also have a transparent HTTP proxy, which breaks apt updates, so you have to manually replace http with https in your apt sources.list.

[andreareina]

How are they breaking apt? Aren’t signatures checked only on the package itself?

[jonatron]

You randomly get 4xx or 5xx response codes (can't remember which one)

[jonas-w]

Why was it only http in the first place?

[iforgotpassword]

So it could be cached by transparent proxies.... Ones that work properly that is.