ubuntu – Ryan Schulze

Fixing Ubuntu 17.04 DNS problems

April 20, 2017February 1, 2018Ryanbash, ubuntu

I recently upgraded my Ubuntu box to 17.04.

Much to my surprise DNS starting behaving strangely, so I checked my DNS server … worked fine if I queried it directly, so I checked if DHCP was giving out the wrong DNS IP … nope, that was fine too. I checked /etc/nsswitch.conf , and that looked fine too so I checked what was ending up in /etc/resolv.conf and was surprised that it contains nameserver 127.0.0.53 instead of the “real” DNS server.

After a bit of research I found out that Ubuntu switched over to using systemd-resolved, which shoves itself between user land and the DNS servers and (at least in Ubuntu 17.04) has problems with servers that support DNSSEC. Very frustrating when you know everything is OK and worked in the past, just systemd messing with stuff and breaking it.

My workaround was to turn of DNSSEC validation. Not pretty but better than no DNS at all, until Ubuntu get’s their problems sorted out.

mkdir /etc/systemd/resolved.conf.d
printf "[Resolve]\nDNSSEC=no\n" >> /etc/systemd/resolved.conf.d/no-dnssec.conf
dpkg-reconfigure resolvconf
# Say 'yes' to 'prepare /etc/resolve.conf for dynamic updates'

mkdir /etc/systemd/resolved.conf.d

printf "[Resolve]\nDNSSEC=no\n" >> /etc/systemd/resolved.conf.d/no-dnssec.conf

dpkg-reconfigure resolvconf

# Say 'yes' to 'prepare /etc/resolve.conf for dynamic updates'

Virtualbox to 4.2.12 problems with Ubuntu

April 16, 2013April 16, 2013Ryan12.04, 12.10, 4.2.10, 4.2.12, ubuntu, virtualbox

After updating Virtualbox to 4.2.12 and updating the guest additions on my Ubuntu 12.10 the guest suddenly started having problems with the graphics driver (X.org wouldn’t start correctly, only starts in “rescue” mode). I did a bit of googling, and it seems other users are also affected (mainly 12.04 and 12.10 Ubuntu), and it seems to affect people who upgraded from virtualbox guest addditions 4.2.10 -> 4.2.12

Here the quick and dirty workaround to the problem: download the 4.2.10 guest additions and use them.

wget http://download.virtualbox.org/virtualbox/4.2.10/VBoxGuestAdditions_4.2.10.iso
mount -o loop VBoxGuestAdditions_4.2.10.iso /mnt
cd /mnt/
bash VBoxLinuxAdditions.run

wget http://download.virtualbox.org/virtualbox/4.2.10/VBoxGuestAdditions_4.2.10.iso

mount -o loop VBoxGuestAdditions_4.2.10.iso /mnt

cd /mnt/

bash VBoxLinuxAdditions.run

Will need to reboot or make sure the new modules are loaded and restart X afterwards.

How to get Teamspeak 3 running on a current Linux

May 24, 2011May 13, 2013Ryan1 CommentDebian, linux, teamspeak 3, ubuntu

Teamspeak is know for lagging a bit behind with development.

The last few days I have been upgrading my servers to current distributions, today the Voice servers were on the list to get Debian 6 / Ubuntu 11.04. And again I ran into problems with Teamspeak, turns out they won’t work with libmysqlclient 16 libraries and require the good old 15 version (which isn’t available out-of-the-box in the latest Debian and Ubuntu release).

So anybody running into the same problem (do a ldd libts3db_mysql.so to check), can hop on over to http://packages.debian.org/lenny/libmysqlclient15off and download the package for your architecture and install it with dpkg -i

Virtualbox update

April 28, 2011Ryanubuntu, virtualbox

Anyone running Ubuntu as a Virtualbox guest is advised to update to Virtualbox 4.0.6 (+ the extensions) that was released today. Don’t forget to recompile the guest additions after upgrading to 4.0.6. Besides the usual stuff in the changelog, the update fixes a problem with screen resolution in Ubuntu 11.04. Since the Ubuntu update is just around the corner updating Virtualbox beforehand will prevent a bit of hassle.