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GNOME 3.20 is only available in Debian testing, so you can:

  • update to testing (which isn't recommended as it isn't stable)
  • install only gnome from testing (which can create new problems as gnome has many dependencies and mixing releases isn't recommended (see Debian Wiki)
  • use a different distribution which is using a newer GNOME version.
  • try to find out if you really need GNOME 3.20 or you can resolve your problems with 3.14
  • wait until the current debian testing (stretch) becomes stable

GNOME 3.20 is only available in Debian testing, so you can:

  • update to testing (which isn't recommended as it isn't stable)
  • install only gnome from testing (which can create new problems as gnome has many dependencies and mixing releases isn't recommended (see Debian Wiki)
  • use a different distribution which is using a newer GNOME version.
  • try to find out if you really need GNOME 3.20 or you can resolve your problems with 3.14

GNOME 3.20 is only available in Debian testing, so you can:

  • update to testing (which isn't recommended as it isn't stable)
  • install only gnome from testing (which can create new problems as gnome has many dependencies and mixing releases isn't recommended (see Debian Wiki)
  • use a different distribution which is using a newer GNOME version.
  • try to find out if you really need GNOME 3.20 or you can resolve your problems with 3.14
  • wait until the current debian testing (stretch) becomes stable
1
source | link

GNOME 3.20 is only available in Debian testing, so you can:

  • update to testing (which isn't recommended as it isn't stable)
  • install only gnome from testing (which can create new problems as gnome has many dependencies and mixing releases isn't recommended (see Debian Wiki)
  • use a different distribution which is using a newer GNOME version.
  • try to find out if you really need GNOME 3.20 or you can resolve your problems with 3.14