Mint Update Manager does not show Changelogs

If you are using Linux Mint, you might have noticed that the latest versions ship with an Update Manager that is able only to show you Changelogs of the packages from the Mint repositories and often they are cut off.

After searching through bug reports and forums finally I prepared a change of the underlying Python code which resolves the issue.

I hope they will integrate similar changes in the next version.

For more details you can have a look at these bug reports, where I got ideas and copied parts:

Install instructions

You can download the needed difference file from here, or just copy and paste the following into a file named mintUpdate.py.diff:
87c87,91
<                 changelog = source
---
>                 changes = source.split("\n")
>                 for change in changes:
>                     change = change.strip()
>                     if change.startswith("*"):
>                         changelog = changelog + change + "\n"
93c97,101
<                     changelog = source
---
>                     changes = source.split("\n")
>                     for change in changes:
>                         change = change.strip()
>                         if change.startswith("*"):
>                             changelog = changelog + change + "\n"
98,102c106,111
<                 source = commands.getstatusoutput("apt-get changelog " + self.source_package) 
<                 if source[0] != 0 or source[1].startswith("Err Changelog of"):
<                     changelog = _("No changelog available") + "\n" + _("Click on Edit->Software Sources and tick the 'Source code' option to enable access to the changelogs")
<                 else:
<                     changelog = source[1]
---
>                 source = commands.getoutput("aptitude changelog " + self.source_package)                    
>                 changes = source.split("urgency=")[1].split("\n")
>                 for change in changes:
>                     change = change.strip()
>                     if change.startswith("*"):
>                         changelog = changelog + change + "\n"
Then you can apply the patch with this command, it will leave a copy of the original script:
sudo patch -lb /usr/lib/linuxmint/mintUpdate/mintUpdate.py mintUpdate.py.diff
It has been created and checked with version 4.3.8.