Você pode resolver algum desses hosts na linha de comando?
jinx:775 Z$ ping us.archive.ubuntu.com
PING us.archive.ubuntu.com (91.189.92.171) 56(84) bytes of data.
64 bytes from cassava.canonical.com (91.189.92.171): icmp_seq=1 ttl=128 time=104 ms
Se não, o próximo passo é tentar host -v
:
jinx:776 Z$ host -v us.archive.ubuntu.com
Trying "us.archive.ubuntu.com"
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 14243
;; flags: qr rd ra; QUERY: 1, ANSWER: 8, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;us.archive.ubuntu.com. IN A
;; ANSWER SECTION:
us.archive.ubuntu.com. 592 IN A 91.189.88.31
us.archive.ubuntu.com. 592 IN A 91.189.88.40
us.archive.ubuntu.com. 592 IN A 91.189.88.45
us.archive.ubuntu.com. 592 IN A 91.189.88.46
us.archive.ubuntu.com. 592 IN A 91.189.92.169
us.archive.ubuntu.com. 592 IN A 91.189.92.170
us.archive.ubuntu.com. 592 IN A 91.189.92.171
us.archive.ubuntu.com. 592 IN A 91.189.88.30
Received 167 bytes from 10.211.55.1#53 in 37 ms
Trying "us.archive.ubuntu.com"
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 50130
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;us.archive.ubuntu.com. IN AAAA
;; AUTHORITY SECTION:
ubuntu.com. 1800 IN SOA ns1.canonical.com. hostmaster.canonical.com. 2011030301 10800 3600 604800 3600
Received 100 bytes from 10.211.55.1#53 in 65 ms
Trying "us.archive.ubuntu.com"
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54875
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;us.archive.ubuntu.com. IN MX
;; AUTHORITY SECTION:
ubuntu.com. 1800 IN SOA ns1.canonical.com. hostmaster.canonical.com. 2011030301 10800 3600 604800 3600
Received 100 bytes from 10.211.55.1#53 in 62 ms
Procure por erros retornados por servidores DNS.