O que posso fazer para corrigir um erro “não foi possível resolver o host: mirrors.fedoraproject.org” ao aplicar as atualizações do sistema?

Question

Este é o segundo dia de recebimento desta mensagem de erro quando tento baixar e instalar atualizações do sistema. Existem 25 atualizações, incluindo uma atualização do sistema operacional, aguardando para serem instaladas.

Detailed errors from the package manager follow:

cannot download Packages/j/java-1.8.0-openjdk-headless-1.8.0.60-14.b27.fc23.i686.rpm to /var/cache/PackageKit/metadata/fedora/packages/: Curl error (6): Couldn't resolve host name for https://mirrors.fedoraproject.org/metalink?repo=fedora-23&arch=x86_64 [Could not resolve host: mirrors.fedoraproject.org]

Eu pude instalar vários pacotes, mas não as atualizações do sistema. Há mais alguma coisa que eu possa experimentar localmente?

Quando vou para link ou mirrors.fedoraproject.org em um navegador, as URLs resolvem. É somente ao fazer uma atualização do sistema que ele falha.

O conteúdo do meu arquivo /etc/resolv.conf :

# Generated by NetworkManager

search hsd1.ma.comcast.net

nameserver 75.75.75.75

nameserver 75.75.76.76

nameserver 2001:558:feed::1

# NOTE: the libc resolver may not support more than 3 nameservers.

# The nameservers listed below may not be recognized.

nameserver 2001:558:feed::2

A saída de sudo ifconfig -a :

enp0s25: flags=4099 mtu 1500

    ether 00:24:7e:e1:89:5b  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

    device interrupt 20  memory 0xfc600000-fc620000  

lo: flags=73 mtu 65536

    inet 127.0.0.1  netmask 255.0.0.0

    inet6 ::1  prefixlen 128  scopeid 0x10<host>

    loop  txqueuelen 0  (Local Loopback)

    RX packets 24  bytes 2064 (2.0 KiB)

    RX errors 0  dropped 0  overruns 0  frame 0

    TX packets 24  bytes 2064 (2.0 KiB)

    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0: flags=4099 mtu 1500

    inet 192.168.124.1  netmask 255.255.255.0  broadcast 192.168.124.255

    ether 52:54:00:1d:e6:d9  txqueuelen 0  (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

virbr0-nic: flags=4098 mtu 1500

    ether 52:54:00:1d:e6:d9  txqueuelen 500  (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

wlp3s0: flags=4163 mtu 1500

    inet 10.0.0.142  netmask 255.255.255.0  broadcast 10.0.0.255

    inet6 2601:184:4500:bff5:221:6aff:fe8b:fbbc  prefixlen 64  scopeid 0x0<global>

    inet6 fe80::221:6aff:fe8b:fbbc  prefixlen 64  scopeid 0x20<link>

    inet6 2601:184:4500:bff5::154d  prefixlen 128  scopeid 0x0<global>

    ether 00:21:6a:8b:fb:bc  txqueuelen 1000  (Ethernet)

    RX packets 17231  bytes 9568612 (9.1 MiB)

    RX errors 0  dropped 0  overruns 0  frame 0

    TX packets 13742  bytes 2820399 (2.6 MiB)

    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0