I have install ArcGIS Server 10.6 on top of Ubuntu Server 18.4 ,gusting on a VM. I was able to create a new site after installation on Server Manager page but after restarting the VM I am not able to access the Server Manager and rest services any more!
I tried to check if the server is running
siteadmin@lingisserver<SPAN class="punctuation token">:</SPAN><SPAN class="operator token">~</SPAN>$ cd arcgis<SPAN class="operator token">/</SPAN>server
siteadmin@lingisserver<SPAN class="punctuation token">:</SPAN><SPAN class="operator token">~</SPAN><SPAN class="operator token">/</SPAN>arcgis<SPAN class="operator token">/</SPAN>server$ <SPAN class="punctuation token">.</SPAN><SPAN class="operator token">/</SPAN>startserver<SPAN class="punctuation token">.</SPAN>sh
Attempting to start ArcGIS Server<SPAN class="punctuation token">.</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="punctuation token">.</SPAN>
<SPAN class="operator token">*</SPAN><SPAN class="operator token">*</SPAN><SPAN class="operator token">*</SPAN> Notice<SPAN class="punctuation token">:</SPAN> There are still server processes running<SPAN class="punctuation token">.</SPAN> Please run
stopserver<SPAN class="punctuation token">.</SPAN>sh to kill these processes and run startserver<SPAN class="punctuation token">.</SPAN>sh again<SPAN class="punctuation token">.</SPAN>
<SPAN class="punctuation token">[</SPAN> OK <SPAN class="punctuation token">]</SPAN>
siteadmin@lingisserver<SPAN class="punctuation token">:</SPAN><SPAN class="operator token">~</SPAN><SPAN class="operator token">/</SPAN>arcgis<SPAN class="operator token">/</SPAN>server$
which means service is running but I am not sure which one is ArcGIS Server here (as is not as clear on Winsows with clear name of ArcGIS Server):
siteadmin@lingisserver<SPAN class="punctuation token">:</SPAN><SPAN class="operator token">~</SPAN>$ service <SPAN class="operator token">--</SPAN>status<SPAN class="operator token">-</SPAN>all
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> acpid
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> alsa<SPAN class="operator token">-</SPAN>utils
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> anacron
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> apparmor
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> apport
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> atd
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> avahi<SPAN class="operator token">-</SPAN>daemon
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> bluetooth
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> console<SPAN class="operator token">-</SPAN>setup<SPAN class="punctuation token">.</SPAN>sh
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> cron
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> cryptdisks
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> cryptdisks<SPAN class="operator token">-</SPAN>early
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> cups
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> cups<SPAN class="operator token">-</SPAN>browsed
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> dbus
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> dns<SPAN class="operator token">-</SPAN>clean
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> ebtables
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> gdm3
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> grub<SPAN class="operator token">-</SPAN>common
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> hwclock<SPAN class="punctuation token">.</SPAN>sh
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> irqbalance
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> iscsid
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> kerneloops
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> keyboard<SPAN class="operator token">-</SPAN>setup<SPAN class="punctuation token">.</SPAN>sh
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> kmod
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> lvm2
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> lvm2<SPAN class="operator token">-</SPAN>lvmetad
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> lvm2<SPAN class="operator token">-</SPAN>lvmpolld
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> lxcfs
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> lxd
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> mdadm
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> mdadm<SPAN class="operator token">-</SPAN>waitidle
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> network<SPAN class="operator token">-</SPAN>manager
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> networking
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> open<SPAN class="operator token">-</SPAN>iscsi
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> open<SPAN class="operator token">-</SPAN>vm<SPAN class="operator token">-</SPAN>tools
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> plymouth
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> plymouth<SPAN class="operator token">-</SPAN>log
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> pppd<SPAN class="operator token">-</SPAN>dns
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> procps
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> rsync
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> rsyslog
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> saned
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> screen<SPAN class="operator token">-</SPAN>cleanup
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> speech<SPAN class="operator token">-</SPAN>dispatcher
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> spice<SPAN class="operator token">-</SPAN>vdagent
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> ssh
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> tomcat8
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> udev
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> ufw
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> unattended<SPAN class="operator token">-</SPAN>upgrades
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> uuidd
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="punctuation token">]</SPAN> whoopsie
<SPAN class="punctuation token">[</SPAN> <SPAN class="operator token">-</SPAN> <SPAN class="punctuation token">]</SPAN> x11<SPAN class="operator token">-</SPAN>common
siteadmin@lingisserver<SPAN class="punctuation token">:</SPAN><SPAN class="operator token">~</SPAN>$
eventually when I navigate to the ArcGIS server URL I am getting this error meesage
