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The Auto update feature in the EM Installer connects to the My Oracle Support (MOS) server to download the patch 4145094 ( this patch number was different was em 11g ) . This patch consists of a file called patch.xml which the installer
parses and creates a directory called “updates” to download all the updates. This directory has the following sub-directories: agent, oms and metadata
For 11g EM we had detailed explanation on how auto update works so look at it for more details MOS note: Overview of the "Auto Update" Feature Available with the Grid Control 18.104.22.168 Installer [ID 1099123.1
I will get this description in 12c install guide appendix as well.
found the solution
Checking monitor: must be configured to display at least 256 colors Failed <<<<
+>>> Could not execute auto check for display colors using command /usr/bin/xdpyinfo. Check if the DISPLAY variable is set.+
Some requirement checks failed. You must fulfill these requirements before
+continuing with the installation,Continue? (y/n) [n]+
because the prereq. are not good, the restart is expecting Y/N. And the restart is silent.
i installed Xdpyinfo package, and the restart went ok now.