The problem has been solved.
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https://bugs.launchpad.net/bugs/2075547
Title:
Hungarian Ubuntu mirror is down
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Public bug reported:
The Hungarian mirror is dead.
~$ curl -kv http://hu.archive.ubuntu.com/
* Trying 45.67.159.244:80...
* TCP_NODELAY set
* Trying 2a09:7ac0::4:80...
* TCP_NODELAY set
* Immediate connect fail for 2a09:7ac0::4: Network is unreachable
* Trying 2a09:7ac0::4:80...
~$ curl -k