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It seems to be that when I install an application via command line (with sudo apt-get someapp), that the application does not appear in the Ubuntu Software list. Is it possible to get such applications to appear there?


Running the command in the comments, it updates and I see this:

...  
All packages are up to date.  
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used.   
GPG error: http://dl.google.com/linux/chrome/deb stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 78BD65473CB3BD13  
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used.   
GPG error: http://dl.google.com/linux/earth/deb stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 78BD65473CB3BD13  
W: Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 78BD65473CB3BD13  
W: Failed to fetch http://dl.google.com/linux/earth/deb/dists/stable/Release.gpg  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 78BD65473CB3BD13  
W: Some index files failed to download. They have been ignored, or old ones used instead.  
Reading package lists... Done  
Building dependency tree         
Reading state information... Done
Package software-center is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'software-center' has no installation candidate

All packages are up to date.
N: Skipping acquire of configured file 'main/binary-i386/Packages' as repository 'http://dl.google.com/linux/earth/deb stable InRelease' doesn't support architecture 'i386'
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package software-center is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'software-center' has no installation candidate
  • Try sudo apt update && sudo apt —reinstall software-center – An0n Feb 2 at 17:59
  • What are the character or characters immediately preceding "reinstall"? – Al Lelopath Feb 2 at 18:14
  • Just 2 dashes "-" – An0n Feb 2 at 18:16
  • $ sudo apt update && sudo apt --reinstall software-center causes message "E: Command line option --reinstall is not understood in combination with the other options" – Al Lelopath Feb 2 at 18:19
  • 3
    You should to fix all those NO_PUBKEY errors before you do anything else. See askubuntu.com/questions/13065. After fixing, we could help you better if you provide an example. – user535733 Feb 2 at 18:43