How to remove warnings like `Unknown media type ...` [duplicate]

Solution 1:

Backup the file that is causing the errors and update the systems mime database:

sudo mv -vi /usr/share/mime/packages/kde.xml /usr/share/mime/packages/kde.xml.bak
sudo update-mime-database /usr/share/mime

This should fix the warnings.

Solution 2:

This was discussed in Why does update-mime-database complain about uri/rtspt and other unusual types? It is caused by kde.xml and they have not fixed it yet. Here is a bug report.

Also it's uri/rtspu, not url/rtspu you should be grepping.

Solution 3:

You should check /usr/share/mime/packages for the specific xml that contains the phrase you get .

For example, my problem was Unknown media type in type 'chemical/...... I found the file /usr/share/mime/packages/chemical-mime-data.xml.

Using cat on the file showed me that the package was the same chemical-mime-data V 0.94

So I ran:

sudo apt-get remove chemical-mime-data

Solution 4:

The bug stems from KDE, and has not been fixed since 2008:

• https://bugs.kde.org/show_bug.cgi?id=303627
• https://bugs.kde.org/show_bug.cgi?id=250924
• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=469833
• https://bugs.launchpad.net/ubuntu/+source/shared-mime-info/+bug/289592