我正在尝试将我的 12.04.2 LTS 升级到 14.04.3 LTS，据说可用。
我已更改我的 source.list 文件以反映 old-releases.ubuntu.com。
但是每次我尝试 sudo apt-get update 时，它都会卡住 [Connecting to old-releases.ubuntu.com (91.189.88.17)]并最终出现错误：
Err http://old-releases.ubuntu.com precise-updates/multiverse Translation-en_US
Unable to connect to old-releases.ubuntu.com:http:
如果我执行此操作，host -v old-releases.ubuntu.com我会得到以下输出：尝试“old-releases.ubuntu.com”
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 16468
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;old-releases.ubuntu.com. IN A
;; ANSWER SECTION:
old-releases.ubuntu.com. 123 IN A 91.189.88.17
Received 57 bytes from 192.168.91.24#53 in 2 ms
Trying "old-releases.ubuntu.com"
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 53799
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;old-releases.ubuntu.com. IN AAAA
;; AUTHORITY SECTION:
ubuntu.com. 422 IN SOA ns1.canonical.com. hostmaster.canonical.com. 2017120602 10800 3600 604800 3600
Received 102 bytes from 192.168.91.24#53 in 1 ms
Trying "old-releases.ubuntu.com"
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 62127
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;old-releases.ubuntu.com. IN MX
;; AUTHORITY SECTION:
ubuntu.com. 422 IN SOA ns1.canonical.com. hostmaster.canonical.com. 2017120602 10800 3600 604800 3600
Received 102 bytes from 192.168.91.24#53 in 1 ms
我也尝试过rm -r /var/lib/apt/lists/*
这不是网络防火墙或代理问题，因为我可以跟踪网络外的流量。我遗漏了什么？