謝謝！

1、我在MX Linux的Brave瀏覽器可以開啟 https://mirrors.ocf.berkeley.edu

2、ifconfig -a
eth0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether 24:4b:fe:49:32:3f txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 195 bytes 13334 (13.0 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 195 bytes 13334 (13.0 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.101.12 netmask 255.255.255.0 broadcast 192.168.101.255
inet6 fe80::a97d:9e55:79c7:c829 prefixlen 64 scopeid 0x20<link>
ether b8:9a:2a:76:1e:16 txqueuelen 1000 (Ethernet)
RX packets 477015 bytes 597721077 (570.0 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 80331 bytes 11758488 (11.2 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

3、我使用下列的 hosts，所以才會出現0.0.0.0
https://github.com/StevenBlack/hosts
然而，我清空Hosts後，再次apt-get upgrade後，系統還是說 Failed to fetch https://mirrors.ocf.berkeley.edu/

$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.101.1 0.0.0.0 UG 600 0 0 wlan0
192.168.101.0 0.0.0.0 255.255.255.0 U 600 0 0 wlan0

4、我有用ipv6！