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W: HTTPS://download.01.org/gfx/ubuntu/16.04/main/dists/xenial/inrelease:signature by key 09D6EF97BFB38E916EF060E756A3DEF863961D39 uses weak digest algorithm (SHA1), E:P roblem executing scripts APT :: Update::P ost-invoke-success ' if/usr/bin/test-w/var/cache/app-info-a-e/usr/bin/appstreamcli then appstreamcli Refresh >/dev/null Fi ', E:sub-process returned an error code Wget-no-check-certificate | sudo apt-key add-wget- No-check-certificate | sudo apt-key add.

W: GPGError: xenial inrelease:the following signatures couldn ' t be verified Because the public key is notAvailable:no_pubkey 56a3def863961d39, W: theRepository ' Https://download.01.org/gfx/ubuntu/16.04/main xenial inrelease ' is notSigned., W:D ATAFrom such a repository can ' t be authenticated and are therefore potentially dangerous to Use., W: SeeApt-secure (8) manpage forRepository creation and User Configuration details., W: thereis no public key available forThe following key ids:56a3def863961d39E:P RoblemExecuting Scripts APT::Update::P ost-invoke-success ' if/usr/bin/test-w/var/cache/app-info-a-e/usr/bin/appstreamcli then appstreamcli Refresh >/dev/null Fi ', E:sub-process returned an error code Then run sudo intel-graphics-update-tool with the following error message:

01.org/gfx/rpm-gpg-group-key-ilg) -O-| sudo apt-key add-sudo apt-get Update Debsudo dpkg-i intel-graphics-update-tool_2.

One, general Intel graphics driver installation and upgradeĭownload Intel-graphics-update-tool for installation, and there will be dependencies on the middle: The general Ubuntu default contains the driver of the Intel graphics card, if not, then determine whether the graphics card is too high, such as the I7 7th generation CPU is not in Ubuntu 16.04, resulting in the screen will be very card, because the Linux 4.4 kernel does not contain Intel HD Graphics 630 driver, the workaround is only to upgrade the Linux kernel to 4.7 in Ubuntu 16.04.