Unable to install Samba 4 on Ubuntu 12.04

Posted on April 5, 2013 by admin

When I tried to install Samba4 on Ubuntu 12.04, I was getting the following error:


root@samba4:~# apt-get install samba4
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Suggested packages:
  phpldapadmin samba-gtk swat2
The following NEW packages will be installed:
  samba4
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/1,662 kB of archives.
After this operation, 11.4 MB of additional disk space will be used.
Preconfiguring packages ...
Traceback (most recent call last):
  File "/usr/bin/samba-tool", line 26, in 
    from samba.netcmd.main import cmd_sambatool
  File "/usr/lib/python2.7/dist-packages/samba/netcmd/main.py", line 24, in 
    from samba.netcmd.delegation import cmd_delegation
  File "/usr/lib/python2.7/dist-packages/samba/netcmd/delegation.py", line 29, in 
    from samba.netcmd.common import _get_user_realm_domain
  File "/usr/lib/python2.7/dist-packages/samba/netcmd/common.py", line 24, in 
    from samba.net import Net
ImportError: libkdc-policy.so: cannot open shared object file: No such file or directory
Selecting previously unselected package samba4.
(Reading database ... 15986 files and directories currently installed.)
Unpacking samba4 (from .../samba4_4.0.0~alpha18.dfsg1-4ubuntu2_amd64.deb) ...
Processing triggers for ureadahead ...
Setting up samba4 (4.0.0~alpha18.dfsg1-4ubuntu2) ...
ERROR: Invalid smb.conf
ERROR: Invalid smb.conf
unable to open smb.conf at /usr/share/samba/setoption.pl line 22.
dpkg: error processing samba4 (--configure):
 subprocess installed post-installation script returned error exit status 2
Errors were encountered while processing:
 samba4
E: Sub-process /usr/bin/dpkg returned an error code (1)

In my case, I won’t be needing the missing modules. The workaround is to tell ubuntu the package installed correctly. Samba worked just fine for me without the missing .so file.

Edit /var/lib/dpkg/status and search for:

Package: samba4
Status: install ok half-configured

Replace with:

Package: samba4
Status: install ok installed

Posted in Linux, Samba | Comments Off on Unable to install Samba 4 on Ubuntu 12.04

How to specify an SSH key with git, without using a config file

Posted on March 29, 2013 by admin

There are a number of ways to do this, but for me setting up an ssh config file was not practical or desirable. I wanted to be able to make a fabric script that becomes a user (that does not have a shell) and does a git pull.

This approach works very well, on the command line, or in a fabric script:


ssh-agent bash -c 'ssh-add /path/to/private_key; git pull'
Posted in git, Linux | Comments Off on How to specify an SSH key with git, without using a config file

Use UTF-8 as the default encoding for postgres databases

Posted on March 29, 2013 by admin

To avoid problems with encoding if you forget to change from the default SQL_ASCII when you create a database, I find it is best to set the default to UTF-8 whenever I set up a new server. One less thing to worry about.

THIS WILL DESTROY ALL DATA. DO NOT DO THIS EXCEPT RIGHT AFTER YOU INSTALL POSTGRES

pg_dropcluster --stop 9.1 main
pg_createcluster --start -e UTF-8 9.1 main
Posted in postgres | Comments Off on Use UTF-8 as the default encoding for postgres databases

PHP Fatal Error: Error Number: 8192 Message: Function split() is deprecated

Posted on March 25, 2013 by admin

This annoyance popped up when I was moving a site from an old RedHat 4.4 server to a new ubuntu 12.04 server.

[Error message: [PHP Fatal Error: Error Number: 8192
Message: Function split() is deprecated

Replacing the split() function with explode() fixed it for me.   I had googled and found a recommendation to use preg_split() but it didn’t work exactly the same.

Posted in PHP | Comments Off on PHP Fatal Error: Error Number: 8192 Message: Function split() is deprecated

Raspberry Pi (raspbian) drops wireless connection after openvpn is started

Posted on March 11, 2013 by admin

Whenever the tap0 or tun0 device came up, my wireless connection would go down within a couple seconds. This was frustrating.

I found that there is a file /etc/default/ifplugd that needs to be edited.

Make it look like this:

INTERFACES="auto"
HOTPLUG_INTERFACES="eth0 wlan0"

This will prevent the default up script from tearing down your wireless connection. By default raspbian has “all” in the HOTPLUG_INTERFACES, which is NOT what we want if using openvpn and wireless.

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Posted in Linux, raspberry pi | Comments Off on Raspberry Pi (raspbian) drops wireless connection after openvpn is started