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Since I have updated debian from jessie to stretch apt-get update fails.

Error Message:

Err:1 http://ftp.de.debian.org/debian stretch InRelease
  Temporary failure resolving 'ftp.de.debian.org'

Internet and DNS are working fine.

This workaround can fix the problem: Stretch apt update failing, missing InRelease file on mirrors

But my question is: Is it possible to fix apt that I can use it again as usual?

ouptput: dig ftp.de.debian.org : 

; <<>> DiG 9.10.3-P4-Debian <<>> ftp.de.debian.org
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 20953
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;ftp.de.debian.org.             IN      A

;; ANSWER SECTION:
ftp.de.debian.org.      365     IN      A       141.76.2.4

;; Query time: 31 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Tue Feb 26 10:30:37 CET 2019
;; MSG SIZE  rcvd: 62

output ls -l /etc/resolv.conf : -rw-r--r-- 1 root root 62 Feb 19 13:07 /etc/resolv.conf

output cat /etc/resolv.conf nameserver 8.8.8.8 nameserver 8.8.4.4 nameserver 192.168.1.2

EDIT: cat /etc/nsswitch.conf

# /etc/nsswitch.conf
#
# Example configuration of GNU Name Service Switch functionality.
# If you have the `glibc-doc-reference' and `info' packages installed, try:
# `info libc "Name Service Switch"' for information about this file.

passwd:         compat
group:          compat
shadow:         compat

hosts:  dns files
networks:       files

protocols:      db files
services:       db files
ethers:         db files
rpc:            db files

netgroup:       nis
rottriges
  • 46
  • I've had dig circumvent my own machine's DNS settings / DNS cache so I don't usually trust it for diagnosing this type of issue. Could you try a simpler test: ping ftp.de.debian.org. If this immediately resolves an IP then it categorically proves your DNS settings are working. – Philip Couling Feb 26 '19 at 09:42
  • ping ftp.de.debian.org fails with the name or the service is unknown so after allt it seems to be a DNS Problem – rottriges Feb 26 '19 at 09:50
  • Is it possible you have firewall rules in place that do not allow you to talk with the outside? – Rui F Ribeiro Feb 26 '19 at 12:21
  • The (longish) output of strace getent hosts ftp.de.debian.org might give us a clue. If you haven't got strace installed, adding the 141.76.2.4 ftp.de.debian.org line to /etc/hosts might help, but don't forget to remove it immediately after the install. – Ferenc Wágner Feb 28 '19 at 09:03

0 Answers0