The reports of Synaptic 0.80~exp2 freezing seem to be consistent for
Ubuntu Raring and Linux Mint 15 RC although it appears that not all
users are experiencing the freeze. What is not consistent is the reason
for the freeze although there is more than one report stating that the
the searching for and/or installing packages causes Synaptic to freeze
hard. A couple other reports state that the freeze occurs when scrolling
through search results using the keyboard arrow keys but not with a
touch pad or mouse scroll wheel. This is what causes the freeze for me
and I can duplicate it successfully.

Starting Synaptic (successfully) from the terminal using the command
"gksu synaptic", doing a "Quick search" and scrolling back and forth
through the search results using the arrow keys freezes Synaptic hard
and gives me this in the terminal repeatedly (repeats about every second
or two):

"widget == NULL with: label_source"

I have to forcibly quit Synaptic but this does not return the command
prompt to the terminal which keeps repeating "widget == NULL with:
label_source". I have to CTRL+C to return the terminal to the command
prompt.  If I try restart to restart Synaptic via the terminal it fails
with this:

"Another synaptic is running. Trying to bring it to the foreground"

Yet under "Processes" tab of "System Monitor", no Synaptic process is
shown. Entering "sudo killall synaptic" in the terminal apparently kills
this wayward synaptic process and I can restart Synaptic successfully.
Doing the same Quick search and scrolling through the search results
using the scroll wheel of the mouse and the touch pad of my laptop
(ThinkPad R61) does not reproduce the freeze while scrolling with the
arrow keys does.

The key difference here is that scrolling through the packages with the
arrow keys highlights each package in sequence while scrolling with the
mouse wheel of touch pad does not.

Hope this info helps.

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https://bugs.launchpad.net/bugs/1178024

Title:
  Synaptic locks up during use

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