release upgrade breaks internet and other things

[Volker Wysk]

Hi

I've done a do-release-upgrade on my 16.04 LTS system. This has broken
the internet connection, and more. I get immediate "unknown host"
errors when I ping to any host. When I lookup an adress in Firefox, I
get a "Page not found, The connection to the server ... failed."

Sorry, I don't know how to troubleshoot this connection problem.

Where should I look..?

Should i even look, or would it be easier to reinstall everything in a
new 18.04.1 system from scratch? (This would be quite a few things.)

Thanks
Volker

[Volker Wysk]

Hi

Aren't the messages which appear during the do-release-upgrade logged
somewhere? I can't find them in /var/log.

Bye
Volker

[Grizzly via ubuntu-users]

03 October 2018 at 19:25, Volker Wysk wrote:
release upgrade breaks internet and (at least in part)

Post by Volker Wysk
Hi
I've done a do-release-upgrade on my 16.04 LTS system. This has broken
the internet connection, and more.

Do/did you connect voa WiFi?

If so try to re-connect to your router (delete and remake that connection)

[Volker Wysk]

Post by Grizzly via ubuntu-users

Post by Volker Wysk
I've done a do-release-upgrade on my 16.04 LTS system. This has broken
the internet connection, and more.

Do/did you connect voa WiFi?
If so try to re-connect to your router (delete and remake that connection)

No, it's my desktop, which is connected by cable.

Bye
Volker

[Ralf Mardorf]

Post by Volker Wysk
No, it's my desktop, which is connected by cable.

Are you connecting via "ip link set up / pppd" or via "dhcpcd"?

IOW if you should use a tool, such as network manager, are you
connecting via a modem by PPPoE or via a router by DHCP?

Perhaps the device name changed. What's the output of

ls -ld /sys/class/net/*

?

Packages installed or removed during a release upgrade are most likely
irrelevant. Important are likely log files related to your Internet
connection, but first at least provide information, how you connect to
the Internet. Are you using a router?

[Volker Wysk]

Post by Ralf Mardorf

Post by Volker Wysk
No, it's my desktop, which is connected by cable.

Are you connecting via "ip link set up / pppd" or via "dhcpcd"?
IOW if you should use a tool, such as network manager, are you
connecting via a modem by PPPoE or via a router by DHCP?

I'm using that what has been installed as a default, when I first set
up the system. This should be DHCP. I have a router (a Fritzbox).

Post by Ralf Mardorf
Perhaps the device name changed. What's the output of
ls -ld /sys/class/net/*

/sys/class/net/enp2s0 ->
../../devices/pci0000:00/0000:00:04.0/0000:02:00.0/net/enp2s0
/sys/class/net/lo -> ../../devices/virtual/net/lo
/sys/class/net/virbr0 -> ../../devices/virtual/net/virbr0
/sys/class/net/virbr0-nic -> ../../devices/virtual/net/virbr0-nic

Post by Ralf Mardorf
Packages installed or removed during a release upgrade are most likely
irrelevant. Important are likely log files related to your Internet
connection, but first at least provide information, how you connect to
the Internet. Are you using a router?

Yes, it's a router.

Thx
Volker

[Volker Wysk]

One thing is funny: I CAN connect inside my WLAN (which consists of a
laptop and the desktop). I just can't connect to the outside. I've
reset the router, but this hasn't changed anything.

Bye
V.W.

[Volker Wysk]

Post by Volker Wysk
One thing is funny: I CAN connect inside my WLAN (which consists of
a laptop and the desktop). I just can't connect to the outside. I've
reset the router, but this hasn't changed anything.

I have to be more precise. The internet connection of my laptop is
okay. I can connect to the outside of the WLAN. But the connection of
my desktop is broken. I can't connect to any site outside the local
WLAN. I can, however, connect to the laptop (which is inside of the
WLAN), but only when I provide the IP address. The laptop's name won't
suffice.

Doesn't that sound like a nameserver problem..?

bye
Volker Wysk

[Ralf Mardorf]

Post by Volker Wysk
Doesn't that sound like a nameserver problem..?

What's the output of e.g.

ping 8.8.8.8

?

[Volker Wysk]

Post by Ralf Mardorf

Post by Volker Wysk
Doesn't that sound like a nameserver problem..?

What's the output of e.g.
ping 8.8.8.8

This succeeds:

PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=120 time=19.5 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=120 time=19.2 ms
...


Bye

[Tom H]

Post by Volker Wysk
I've done a do-release-upgrade on my 16.04 LTS system. This has broken
the internet connection, and more. I get immediate "unknown host"
errors when I ping to any host. When I lookup an adress in Firefox, I
get a "Page not found, The connection to the server ... failed."
Sorry, I don't know how to troubleshoot this connection problem.
Where should I look..?
Should i even look, or would it be easier to reinstall everything in a
new 18.04.1 system from scratch? (This would be quite a few things.)

Previous upgrades with network problems turned out to be dns problems.
/etc/resolv.conf" was a symlink pointing at the wrong file, IIRC.

Is it a file or a symlink?

If a symlink, to which file is it pointing?

What are the name servers?

[Volker Wysk]

Post by Tom H

Post by Volker Wysk
I've done a do-release-upgrade on my 16.04 LTS system. This has broken
the internet connection, and more. I get immediate "unknown host"
errors when I ping to any host. When I lookup an adress in Firefox, I
get a "Page not found, The connection to the server ... failed."
Sorry, I don't know how to troubleshoot this connection problem.
Where should I look..?
Should i even look, or would it be easier to reinstall everything in a
new 18.04.1 system from scratch? (This would be quite a few things.)

Previous upgrades with network problems turned out to be dns problems.
/etc/resolv.conf" was a symlink pointing at the wrong file, IIRC.
Is it a file or a symlink?
If a symlink, to which file is it pointing?
What are the name servers?

It's a symlink to /run/resolvconf/resolv.conf. Which is EMPTY. Looks
like we have the culprit here.

It only contains this (commented out) note:

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

Bye
VW

[Tom H]

Post by Volker Wysk

Post by Tom H

Post by Volker Wysk
I've done a do-release-upgrade on my 16.04 LTS system. This has broken
the internet connection, and more. I get immediate "unknown host"
errors when I ping to any host. When I lookup an adress in Firefox, I
get a "Page not found, The connection to the server ... failed."
Sorry, I don't know how to troubleshoot this connection problem.
Where should I look..?
Should i even look, or would it be easier to reinstall everything in a
new 18.04.1 system from scratch? (This would be quite a few things.)

Previous upgrades with network problems turned out to be dns problems.
/etc/resolv.conf" was a symlink pointing at the wrong file, IIRC.
Is it a file or a symlink?
If a symlink, to which file is it pointing?
What are the name servers?

It's a symlink to /run/resolvconf/resolv.conf. Which is EMPTY. Looks
like we have the culprit here.
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

It should most likely point at "/run/systemd/resolve/resolv.conf".

[Ralf Mardorf]

Post by Tom H
It should most likely point at "/run/systemd/resolve/resolv.conf".

For container usage I prefer a file over a link.

[***@archlinux rocketmouse]# systemd-nspawn -qD /mnt/moonstudio lsb_release -a
LSB Version: core-9.20160110ubuntu0.2-amd64:core-9.20160110ubuntu0.2-noarch:security-9.20160110ubuntu0.2-amd64:security-9.20160110ubuntu0.2-noarch
Distributor ID: Ubuntu
Description: Ubuntu 16.04.5 LTS
Release: 16.04
Codename: xenial
[***@archlinux rocketmouse]# ls -l /mnt/moonstudio/etc/resolv.conf
-rw-r--r-- 1 root root 94 Oct 1 19:04 /mnt/moonstudio/etc/resolv.conf
[***@archlinux rocketmouse]# cat /mnt/moonstudio/etc/resolv.conf
# Generated by resolvconf
domain localdomain
nameserver 192.168.1.1
nameserver fe80::1%enp3s0
[***@archlinux rocketmouse]#
[***@archlinux rocketmouse]#
[***@archlinux rocketmouse]#
[***@archlinux rocketmouse]# lsb_release -a
LSB Version: 1.4
Distributor ID: Arch
Description: Arch Linux
Release: rolling
Codename: n/a
[***@archlinux rocketmouse]# ls -l /etc/resolv.conf
-rw-r--r-- 1 root root 94 Oct 1 19:04 /etc/resolv.conf
[***@archlinux rocketmouse]# cat /etc/resolv.conf
# Generated by resolvconf
domain localdomain
nameserver 192.168.1.1
nameserver fe80::1%enp3s0

[Liam Proven]

Post by Volker Wysk
Hi
I've done a do-release-upgrade on my 16.04 LTS system. This has broken
the internet connection, and more. I get immediate "unknown host"
errors when I ping to any host. When I lookup an adress in Firefox, I
get a "Page not found, The connection to the server ... failed."
Sorry, I don't know how to troubleshoot this connection problem.
Where should I look..?

I had this, or something like it.

This is relevant and I think it's what I did to fix it:

https://askubuntu.com/questions/966870/dns-not-working-after-upgrade-17-04-to-17-10
--
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