I am new to OpenStack. While installing devstack on my Ubuntu 16.04 VM, during the execution of

./stack.sh

I got the following error:

+lib/etcd3:install_etcd3:121               echo ' /opt/stack/devstack/files/etcd-v3.1.7-linux-arm64.tar.gz'
+lib/etcd3:install_etcd3:123               sha256sum -c /opt/stack/devstack/files/etcd.sha256sum
sha256sum: /opt/stack/devstack/files/etcd.sha256sum: no properly formatted SHA256 checksum lines found
+lib/etcd3:install_etcd3:1                 exit_trap
+./stack.sh:exit_trap:521                  local r=1
++./stack.sh:exit_trap:522                  jobs -p
+./stack.sh:exit_trap:522                  jobs=
+./stack.sh:exit_trap:525                  [[ -n '' ]]
+./stack.sh:exit_trap:531                  '[' -f '' ']'
+./stack.sh:exit_trap:536                  kill_spinner
+./stack.sh:kill_spinner:417               '[' '!' -z '' ']'
+./stack.sh:exit_trap:538                  [[ 1 -ne 0 ]]
+./stack.sh:exit_trap:539                  echo 'Error on exit'
Error on exit
+./stack.sh:exit_trap:540                  generate-subunit 1517844452 85 fail
+./stack.sh:exit_trap:541                  [[ -z /opt/stack/logs ]]
+./stack.sh:exit_trap:544                  /opt/stack/devstack/tools/worlddump.py -d /opt/stack/logs
World dumping... see /opt/stack/logs/worlddump-2018-02-05-152857.txt for details
+./stack.sh:exit_trap:550                  exit 1

I also checked the worlddump file, but I didn't see nothing strange, in my opinion.

I strictly followed the steps described in the devstack openstack guide.

Any tips, please? Thanks!