unknown media type in type 'all/all'

解决

cd /usr/share/mime/packages/
gedit kde.xml

ctrl+F 搜索“all/all”
然后移除这一段代码

<!-- all/ fake mime types -->
  <mime-type type="all/all">
    <comment>all files and folders</comment>
  </mime-type>
  <mime-type type="all/allfiles">
    <comment>all files</comment>
  </mime-type>

  <!-- uri/ fake mime types -->
  <mime-type type="uri/mms">
    <comment>mms: URIs</comment>
  </mime-type>
  <mime-type type="uri/mmst">
    <comment>mmst: URIs</comment>
  </mime-type>
  <mime-type type="uri/mmsu">
    <comment>mmsu: URIs</comment>
  </mime-type>
  <mime-type type="uri/pnm">
    <comment>pnm: URIs</comment>
  </mime-type>
  <mime-type type="uri/rtspt">
    <comment>rtspt: URIs</comment>
  </mime-type>
  <mime-type type="uri/rtspu">
    <comment>rtspu: URIs</comment>
  </mime-type>