It's a bug in launchpad... Try
apt-get install language-pack-en
LC_ALL=en_US.UTF-8 add-apt-repository ppa:cz.nic-labs/knot-dns
On August 20, 2015 9:59:25 AM GMT+02:00, Ken Peng <kpeng(a)runbox.com> wrote:
 Hello,
I upgraded the system to ubuntu 14.04 x64. following the document
again,but got:
# add-apt-repository ppa:cz.nic-labs/knot-dns
  Knot DNS is a high-performance authoritative-only DNS server which
supports all key features of the domain name system including zone
transfers, dynamic updates and DNSSEC.
 More info: 
https://launchpad.net/~cz.nic-labs/+archive/ubuntu/knot-dns
Press [ENTER] to continue or ctrl-c to cancel adding it
gpg: keyring `/tmp/tmpyqfouwgp/secring.gpg' created
gpg: keyring `/tmp/tmpyqfouwgp/pubring.gpg' created
gpg: requesting key F9C59A45 from hkp server 
keyserver.ubuntu.com
gpg: /tmp/tmpyqfouwgp/trustdb.gpg: trustdb created
gpg: key F9C59A45: public key "Launchpad Datovhr" imported
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python3.4/threading.py", line 920, in _bootstrap_inner
     self.run()
   File "/usr/lib/python3.4/threading.py", line 868, in run
     self._target(*self._args, **self._kwargs)
   File
"/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py",
line 687, in addkey_func
     func(**kwargs)
 File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line
370, in add_key
     return apsk.add_ppa_signing_key()
 File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line
261, in add_ppa_signing_key
     tmp_export_keyring, signing_key_fingerprint, tmp_keyring_dir):
 File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line
210, in _verify_fingerprint
     got_fingerprints = self._get_fingerprints(keyring, keyring_dir)
 File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line
202, in _get_fingerprints
     output = subprocess.check_output(cmd, universal_newlines=True)
   File "/usr/lib/python3.4/subprocess.py", line 605, in check_output
   output, unused_err = process.communicate(inputdata, timeout=timeout)
   File "/usr/lib/python3.4/subprocess.py", line 936, in communicate
     stdout = _eintr_retry_call(self.stdout.read)
File "/usr/lib/python3.4/subprocess.py", line 487, in _eintr_retry_call
     return func(*args)
   File "/usr/lib/python3.4/encodings/ascii.py", line 26, in decode
     return codecs.ascii_decode(input, self.errors)[0]
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position
86:
ordinal not in range(128)
how to fix up this? Thanks.
On 2015/8/20 星期四 15:49, Ondřej Surý wrote:
  Hi,
 I am sorry, but Debian 6.0 is not supported as we require more recent
 build tools and also many libraries are not recent enough or present 
in
  Debian LTS.
 You might be able to produce a static binaries on Debian Jessie and 
copy
  them to the old system, or prepare Debian Jessie
chroot on your old 
system.
 However I would rather recommend upgrading the main system to recent
 Debian stable and move the stuff that require Debian 6.0 inside LXC
 container.
 Cheers, Ondřej
 On August 20, 2015 3:51:42 AM GMT+02:00, Ken Peng <kpeng(a)runbox.com> 
wrote:
     Hi,
     My system is debian 6.0 (yes I know it's out of date).
     When I installed knot from source following the document, I got 
failed
      as below. How can I get continued? thanks.
     $ autoreconf -i -f
     libtoolize: putting auxiliary files in `.'.
     libtoolize: copying file `./ltmain.sh  <http://ltmain.sh>'
     libtoolize: putting macros in AC_CONFIG_MACRO_DIR, `m4'.
     libtoolize: copying file `m4/libtool.m4'
     libtoolize: copying file `m4/ltoptions.m4'
     libtoolize: copying file `m4/ltsugar.m4'
     libtoolize: copying file `m4/ltversion.m4'
     libtoolize: copying file `m4/lt~obsolete.m4'
     configure.ac:35: error: possibly undefined macro: AC_SUBST
             If this token and others are legitimate, please use 
m4_pattern_allow.
              See the Autoconf documentation.
     configure.ac:93: error: possibly undefined macro: AS_IF
     configure.ac:102: error: possibly undefined macro: AC_MSG_WARN
     configure.ac:122: error: possibly undefined macro: AC_DEFINE
     configure.ac:163: error: possibly undefined macro: AC_MSG_ERROR
     configure.ac:251: error: possibly undefined macro: AC_SEARCH_LIBS
     autoreconf: /usr/bin/autoconf failed with exit status: 1
     
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