Public bug reported:

The lines in /usr/share/applications/mate-mimeapps.list end in
semicolons while they shouldn't; and that breaks xdg-mime and xdg-open.

Specifically:
$ grep plain /usr/share/applications/mate-mimeapps.list
text/plain=pluma.desktop;

That should be like that instead:
text/plain=pluma.desktop

A small effect of of the issue is:
$ xdg-mime query default text/plain 
pluma.desktop;

That should return plain "pluma.desktop".

To see a more severe effect, we have to do a few changes in order for xdg-open 
to actually use that file, because by default it falls back to gvfs-open and 
doesn't use it at all.
sudo mkdir -p /usr/local/share/applications
sudo ln -s /usr/share/applications/mate-mimeapps.list 
/usr/local/share/applications/mimeapps.list
sudo strace -e trace=file xdg-open /etc/adduser.conf 2>&1 | grep "desktop;"
...
faccessat(AT_FDCWD, "/usr/local/share//applications//pluma.desktop;", R_OK) = 
-1 ENOENT (No such file or directory)

I.e. it tries to find a "pluma.desktop;" file and fails, instead of searching 
for "pluma.desktop".
Then it opens the file with "less" and "libreoffice" at the same time!

==> I propose that /usr/share/applications/mate-mimeapps.list gets dropped 
completely.
ubuntu-mate-default-settings ships /usr/share/mate/applications/defaults.list 
as well, and that one is more complete and doesn't have syntax errors.

** Affects: ubuntu-mate-settings (Ubuntu)
     Importance: Medium
     Assignee: Martin Wimpress (flexiondotorg)
         Status: In Progress

** Affects: ubuntu-mate-settings (Ubuntu Xenial)
     Importance: Low
     Assignee: Martin Wimpress (flexiondotorg)
         Status: Triaged

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https://bugs.launchpad.net/bugs/1673156

Title:
  Syntax error in /usr/share/applications/mate-mimeapps.list

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