[ubuntu_studio] After Upgrade to v16.04 - Install Software Disappeared?

Code:

stephen@stephen-evo-5723:~$ sudo apt-get install -f
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libcuda1-352-updates nvidia-libopencl1-352-updates vcdimager
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 11 not upgraded.
stephen@stephen-evo-5723:~$ sudo apt-get update
Get:1 http://ift.tt/10bpJUs xenial InRelease [7,894 B]
Ign:2 http://ift.tt/2alhi4m bitdefender InRelease          
Hit:3 http://ift.tt/2alhi4m bitdefender Release            
Ign:1 http://ift.tt/10bpJUs xenial InRelease  
Hit:4 http://ift.tt/l8sLSw xenial InRelease                  
Hit:5 http://ift.tt/2alhK2n xenial InRelease           
Hit:7 http://ift.tt/l8sLSw xenial-updates InRelease         
Hit:8 http://ift.tt/O9IlDM xenial InRelease 
Get:9 http://ift.tt/l8sLSw xenial-security InRelease [94.5 kB]
Hit:10 http://ift.tt/1nDMP5z xenial InRelease 
Hit:11 http://ift.tt/2axFa8g xenial InRelease    
Hit:12 http://ift.tt/1b1mM2W xenial InRelease       
Hit:13 http://ift.tt/2axEHTp stable InRelease
Fetched 102 kB in 1s (80.3 kB/s)
Reading package lists... Done
W: GPG error: http://ift.tt/10bpJUs xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A2F683C52980AECF
W: The repository 'http://ift.tt/10bpJUs xenial InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: http://ift.tt/2alhNeD: Signature by key 639ADD458616BD06A1B55F9CA373FB480EC4FE05 uses weak digest algorithm (SHA1)
stephen@stephen-evo-5723:~$ sudo apt autoremove
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be REMOVED:
  libcuda1-352-updates nvidia-libopencl1-352-updates vcdimager
0 upgraded, 0 newly installed, 3 to remove and 11 not upgraded.
After this operation, 29.6 MB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 257396 files and directories currently installed.)
Removing libcuda1-352-updates (352.63-0ubuntu0.14.04.1) ...
Removing nvidia-libopencl1-352-updates (352.63-0ubuntu0.14.04.1) ...
Removing vcdimager (0.7.24+dfsg-0.1ubuntu2) ...
Processing triggers for libc-bin (2.23-0ubuntu3) ...
Processing triggers for man-db (2.7.5-1) ...
stephen@stephen-evo-5723:~$ sudo apt-get install software-center
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

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[ubuntu_studio] After Upgrade to v16.04 - Install Software Disappeared?