Error: Execution of '/usr/bin/apt-get -q -y -o DPkg::Options::=--force-confold install euca2ools' returned 100: Reading package lists...
Building dependency tree...
Reading state information...
The following extra packages will be installed:
  cloud-utils
The following NEW packages will be installed:
  cloud-utils euca2ools
0 upgraded, 2 newly installed, 0 to remove and 21 not upgraded.
Need to get 200 kB of archives.
After this operation, 1032 kB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
  euca2ools
E: There are problems and -y was used without --force-yes

Error: /Stage[main]/Nova::Utilities/Package[euca2ools]/ensure: change from purged to present failed: Execution of '/usr/bin/apt-get -q -y -o DPkg::Options::=--force-confold install euca2ools' returned 100: Reading package lists...
Building dependency tree...
Reading state information...
The following extra packages will be installed:
  cloud-utils
The following NEW packages will be installed:
  cloud-utils euca2ools
0 upgraded, 2 newly installed, 0 to remove and 21 not upgraded.
Need to get 200 kB of archives.
After this operation, 1032 kB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
  euca2ools
E: There are problems and -y was used without --force-yes