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Update Manger has frozen for about 60min when downloading flashplugin-installer.
And the Cancel button of Applying Changes dialog is disabled.
When I click the top-left x, it doesn't response.
How to cancel downloading flashplugin-installer?

Setting up libxatracker1 (8.0.2-0ubuntu3.1) ...
Setting up update-manager-core (1: ...
Setting up update-manager (1: ...
Setting up update-notifier-common (0.119ubuntu8.4) ...
flashplugin-installer: downloading
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up vote 2 down vote accepted

It doesn't take much time to install flashplugin. To check whether update is still working (downloading/installing) check the output of this command:
ps aux | grep http
This will result in 2 or 3 lines with the second column of each line being the pid of the process if the process is doing its job. If the result is just 1 line, say the last phrase being grep http or something, the updates are not being downloaded/installed. Its safe to kill the update manager
To do this:
run: ps aux | grep update and note the pid of the update-manager being the second column after your user name in the 2/3 line list of output. Let the pid of update-manager be pid
Kill this process by running:
kill -9 pid
If operation is not permitted, try with sudo, but take care that you don't kill any other process. Note the pid of update-manager carefully.

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The download will never start for many people, I knew it.

Something wrong as the server too slow or just not able to ping back.

See the "featured/headline" thread in for instance.

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I couldn't read chinese... – Calmarius Jun 11 '14 at 7:08

Here's what I did (during a distribution upgrade, so it was critical):

First I found the stuck process (number 12123 in my case):

> pstree -p
│            ├─precise(9757)─┬dpkg(24158)─update-notifier(19121)─package-data-do(19123)
│            │               └{precise}(9759)

Then I helped out with bug report: . By running "sudo gdb" then "attach 19123" and "bt" to create a backtrace. The backtrace helps the volunteers determine what's wrong.

Finally I used "sudo kill 19123" and received error message "Could not install 'update-notifier-common'" "subprocess installed post-installation script returned error exit status 143".

The rest of the install then completed without incident. Dealing with flash can come another day.

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Perfect - just saved me a lot of frustration! – jfacemyer Nov 2 '14 at 20:52

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