After tried everything, finally i found this tip that worked for me.
How to make Chromium/Chrome open magnet links in Linux Mint/Ubuntu Mate
I. To make Chromium/ Chrome open magnet links with Transmission or qBittorent in Linux Mint, just open the terminal and run the following three commands:
For Transmission client:
gconftool-2 -t string -s /desktop/gnome/url-handlers/magnet/command "transmission %s"
For qBittorent
gconftool-2 -t string -s /desktop/gnome/url-handlers/magnet/command "qBittorrent %s"
Next
gconftool-2 -s /desktop/gnome/url-handlers/magnet/needs_terminal false -t bool
gconftool-2 -t bool -s /desktop/gnome/url-handlers/magnet/enabled true
II. Edit the file xdg-open. Just use your favorite text editor, in MATE, the command will be:
sudo pluma /usr/bin/xdg-open
When the file is open, search for the following lines ( start at line #300 in my case):
#--------------------------------------
Checks for known desktop environments
set variable DE to the desktop environments name, lowercase
detectDE()
{
if [ x"$KDE_FULL_SESSION" = x"true" ]; then DE=kde;
elif [ x"$GNOME_DESKTOP_SESSION_ID" != x"" ]; then DE=gnome;
elifdbus-send --print-reply --dest=org.freedesktop.DBus /org/freedesktop/DBus org.freedesktop.DBus.GetNameOwner string:org.gnome.SessionManager > /dev/null 2>&1; then DE=gnome;
elif xprop -root _DT_SAVE_MODE 2> /dev/null | grep ' = "xfce4"$' >/dev/null 2>&1; then DE=xfce;
elif [ x"$DESKTOP_SESSION" = x"LXDE" ]; then DE=lxde;
else DE=""
fi
}
Replace ( you can just comment / to coment, just add # before the line \ out for back-up purpose) everything between the two braces with "DE=gnome;", the file should look like this:
#--------------------------------------
Checks for known desktop environments
set variable DE to the desktop environments name, lowercase
detectDE()
{
DE=gnome;
}
Restart