我最近升级了我的系统，现在我看到一个非常奇怪的错误，有什么想法可以解决这个问题吗？：
nslookup 8.8.8.8
../../../../lib/isc/unix/socket.c:2135: internal_send: 192.168.43.232#53: Required key not available
../../../../lib/isc/unix/socket.c:2137: unable to convert errno to isc_result: 126: Required key not available
8.8.8.8.in-addr.arpa name = dns.google.
Authoritative answers can be found from:
编辑：
不幸的是，我没有注意到通过软件中心应用程序完成的版本，我正在运行 Ubuntu 18.04 的变体（ pop_os ）
systemd-resolve --status：
Global
DNS Servers: 192.168.43.220
Link 3 (wlp113s0)
Current Scopes: DNS
LLMNR setting: yes
MulticastDNS setting: no
DNSSEC setting: no
DNSSEC supported: no
DNS Servers: 192.168.43.232
2600:1014:b02f:45d5::c3
nmap -p 53 -Pn 192.168.43.232
Starting Nmap 7.60 ( https://nmap.org ) at 2019-07-26 14:00 CDT
Nmap scan report for 192.168.43.232
Host is up.
PORT STATE SERVICE
53/tcp filtered domain
Nmap done: 1 IP address (1 host up) scanned in 2.03 seconds
dig 8.8.8.8：
../../../../lib/isc/unix/socket.c:2135: internal_send: 192.168.43.232#53: Required key not available
../../../../lib/isc/unix/socket.c:2137: unable to convert errno to isc_result: 126: Required key not available
; <<>> DiG 9.11.3-1ubuntu1.8-Ubuntu <<>> 8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49678
;; flags: qr aa rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;8.8.8.8. IN A
;; ANSWER SECTION:
8.8.8.8. 0 IN A 8.8.8.8
;; Query time: 6 msec
;; SERVER: 2600:1014:b02f:45d5::c3#53(2600:1014:b02f:45d5::c3)
;; WHEN: Fri Jul 26 14:03:02 CDT 2019
;; MSG SIZE rcvd: 41
可能相关：
- https://askubuntu.com/questions/914997/install-virtualbox-while-keeping-secure-boot
- 无法插入“vboxdrv”：所需的密钥不可用
- 无法使用安全启动在 Fedora 上加载 zfs 内核模块 - “必需的密钥不可用”
- https://askubuntu.com/questions/891248/ubuntu-16-04-how-can-i-disable-secure-boot
- 已签名的内核模块 - “未使用受信任的密钥签名”
- http://man7.org/linux/man-pages/man2/request_key.2.html
可能的解决方案
- 尝试解锁端口 53。
- 我遇到了一个问题，docker-compose 对网络做了一些奇怪的事情，所以我跑了
docker-compose down && docker-compose up