Ubuntu Jaunty no sound fluxbox, possible utube fix too.

No sound available in my fluxbox, nomatter which sound card I select (and i plugged new usb ones in, and selected them in audacity, to no avail). Then I found

http://www.ubuntugeek.com/simple-guide-to-sound-solutions-for-hardyintrepid-and-jaunty-jackalope-users.html

providing help for those using Gnome. I following the instructions:

sudo apt-get install asoundconf-gtk gnome-alsamixer alsa-oss libasound2 libasound2-plugins padevchooser gstreamer0.10-pulseaudio ubuntu-restricted-extras

The ubuntu-restricted-extras package, it is claimed, can help with websites streaming content.

The help page had plenty of pointers, all using gnome. On exciting fluxbox, running gnome, I
could do:

System / preference / sound

which, according to `ps -A', ran

gnome-volume-control

Executing this from a terminal showed that in spite of alsa-mixer showing no mute, gnome-volume-control was set to mute. How, who knows?

Anyway, unsetting mute, fixed the audio. Now, can I have those three hours of frustration refunded, please?

\left( \right) incompatible with something

\begin{align}
\sum_{a=1}^{n_{GL}} \sum_{i=1}^{n_{H}} \sum_{j=1}^{n_{H}}
G_{w1} G_{w2} G_{w3} |J_{a}|
( &
\frac{\partial H_{ai}}{\partial x}
\frac{\partial H_{aj}}{\partial x}
+ \frac{\partial H_{ai}}{\partial y}
\frac{\partial H_{aj}}{\partial y}
+ \frac{\partial H_{ai}}{\partial z}
\frac{\partial H_{aj}}{\partial z}
- k^{2} H_{ai} H_{aj} \\ % ie k^2 * w * p
& + 2i
(
M_{x} k H_{ai} \frac{\partial H_{aj}}{\partial x}
+ M_{y} k H_{ai} \frac{\partial H_{aj}}{\partial y}
+ M_{z} k H_{ai} \frac{\partial H_{ak}}{\partial z}
)
)
\end{align}

works. Changing the parentheses to \left( and \right) fails, reason unknown.

It's not all bad news, though. This form works:

\begin{equation}
\begin{split}
x & = y \\
& = \left( z \right)
\end{split}
\end{equation}

Watch the direction of the new line delimiters.

More fiddling showed a line break could not occur between the \left( and \right). ?!

http://www.latex-community.org/forum/viewtopic.php?f=46&t=4823

showed that terminating a line before the break with, \right.
and starting the next line with \left.

fixes these problems.

cron crontab automated commands

crontab -e

mtab fstab mounting problems

I couldn't mount my win directory at startup, but could with default options in a terminal, later.

Inspection of /etc/mtab showed the working command. I copied it to fstab. It worked. :)

Latex setup

sudo apt-get install texlive

or, for the full installation:

sudo apt-get install texlive-full

mpi, pypar, koala

sudo apt-get install openmpi-bin

sudo apt-get install libopenmpi-dev

sudo apt-get install subversion

mkdir -p ~/Downloads/pypar
cd ~/Downloads/pypar
svn checkout http://pypar.googlecode.com/svn pypar-read-only

cd pypar-read-only/source
sudo python setup.py install

Worked on koala, as long as numpy was installed beforehand.

rsync

Jump to end, for fix:


Attempting to connect to work, rsync appears to hang. Is the deamon running?

According to the rsync man page, the rsync daemon should get started up
by specifying it in

/etc/services

Checking this file shows around 600 entries. Add,

rsync 873/tcp

where, i presume, 873 is the contact port. My port number was incorrect.

Checking /etc/inetd.conf showed it was empty. I added,

rsync stream tcp nowait root /usr/bin/rsync rsyncd --daemon

as per the man page. I then reset the machine, as I couldn't figure out how to send HUP to inetd, given it wasn't listed via ps -A

------------ fix -------------

Don't try to run the rsync daemon in a different way on the host.
At the client, specify the port: eg

rsync -avzrP --rsh='ssh -p123' login@192.168.1.1:/home/me/whatever ./

works.