After installing an update to WordPress I received the error:

“Briefly unavailable for scheduled maintenance. Check back in a minute.”

I was unsure if this was down to my hosts servers being temporarily down, going down during the update or if WordPress had simply failed to update whatever it was updating. Turns out it was the latter and it’s really easy to fix, first log on to your ftp, file manager or whatever for your hosting and browse to your wordpress install, in the root of this there should be a .maintenance file, just delete this and everything should be back to normal. Once back in the WordPress dashboard you may be asked to reinstall whatever failed however sometimes it will have completed the install and just not managed to delete this file.

:~$ gimp
gimp: fatal error: Failed to register GObject with DBusConnection

(script-fu:3100): LibGimpBase-WARNING **: script-fu: gimp_wire_read(): error

I fixed this error by removing opening Synaptic Package Manager and searching for appmenu-gtk, right click and mark for removal, once this has been done it should begin to work again.

An error occurred while mounting /dev/bus/usb (and/or)
An error occurred while mounting /proc/bus/usb

Press S to skip mounting or M for manual recovery

If you are seeing this error on boot an easy way to get rid:

1. sudo gedit /etc/fstab
2. Fine the following line (or lines if you are having both errors)

none /proc/bus/usb usbfs defaults,devmode=0666 0 0
none /dev/bus/usb usbfs defaults,devmode=0666 0 0

3. Add a # infront of them to comment it out
4. Save & Exit.

As far as I am aware everything is still working fine and it might just be something left in from Karmic which isn’t needed any longer but just to make sure comment out these lines rarther than removing them.

symbol lookup error: /usr/local/lib/libhighgui.so.4: undefined symbol: av_free_packet

To fix it simply make sure /usr/local/lib is in your library path by using the following command:

export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH

While installing opencv on an older version of debian for work I kept getting an error while loading shared libraries which turned out to be a pretty easy fix, just finding the libraries and adding them to the dynamic linker.

The libraries I was having trouble with below:
./blobtrack: error while loading shared libraries: libcxcore.so.1: cannot open shared object file: No such file or directory

ffmpeg
ffmpeg: error while loading shared libraries: libavdevice.so.52: cannot open shared object file: No such file or directory

I used the ‘locate’ command to find where the libraries were eg:
locate libcxcore.so.1
This outputted a few locations of where the library was, I decided to use the /usr/local/lib version as both libraries I needed were in there and did the following command to add them to ld.so.conf and reload the dynamic linker:
sh -c 'echo "/usr/local/lib" >> /etc/ld.so.conf && ldconfig'