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RUN apt-get clean
RUN apt-get update
RUN apt-get install -y ca-certificates
RUN uname -a
RUN apt-get install --fix-missing -y ssmtp
RUN apt-get install -y mailutils
RUN apt-get install -y cmake
 
 
....
....
 
Building dependency tree...
Reading state information...
The following additional packages will be installed:
  libgnutls-openssl27
The following NEW packages will be installed:
  libgnutls-openssl27 ssmtp
0 upgraded, 2 newly installed, 0 to remove and 12 not upgraded.
Need to get 239 kB of archives.
After this operation, 236 kB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
  libgnutls-openssl27 ssmtp
E: There were unauthenticated packages and -y was used without --allow-unauthenticated
The command '/bin/sh -c apt-get install --fix-missing -y ssmtp' returned a non-zero code: 100

prog.cpp:13:13: warning: character constant too long for its type
 The command '/bin/sh -c apt-get install --fix-missing -y ssmtp' returned a non-zero code: 100
             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.cpp:1:1: error: ‘Building’ does not name a type
 Building dependency tree...
 ^~~~~~~~

Standard output is empty