OK... so apparently it is NOT installed...
joe@patrickstar:~$ dpkg --get-selections | grep tvh
joe@patrickstar:~$ 
joe@patrickstar:~$ which tvheadend
joe@patrickstar:~$ 
joe@patrickstar:~$ find / -name tvheadend 2>&1 | grep -v 'Permission denied'
joe@patrickstar:~$ 
Again, I followed the installation instructions on https://tvheadend.org/projects/tvheadend/wiki/AptRepository for ubuntu... I saw no indication of errors...
Repeating installation here:
removing previous launchpad ppa
joe@patrickstar:~$ sudo apt-add-repository -r 
http://ppa.launchpad.net/adamsutton/tvheadend
[sudo] password for joe: 
Error: 'deb 
http://ppa.launchpad.net/adamsutton/tvheadend precise main' doesn't exist in a sourcelist file
Error: 'deb-src 
http://ppa.launchpad.net/adamsutton/tvheadend precise main' doesn't exist in a sourcelist file
joe@patrickstar:~$ 
import GPG signing key:
joe@patrickstar:~$ curl 
http://apt.tvheadend.org/repo.gpg.key | sudo apt-key add -
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  1744  100  1744    0     0   3183      0 --:--:-- --:--:-- --:--:-- 16148
OK
joe@patrickstar:~$ 
adding repository:
joe@patrickstar:~$ sudo apt-add-repository 
http://apt.tvheadend.org/stable
joe@patrickstar:~$ 
joe@patrickstar:~$ sudo apt-get update
Hit 
http://dl.google.com stable Release.gpg
Hit 
http://dl.google.com stable Release                                                                  
Hit 
http://us.archive.ubuntu.com precise Release.gpg                                                     
Get:1 
http://us.archive.ubuntu.com precise-updates Release.gpg [198 B]                                   
Hit 
http://us.archive.ubuntu.com precise-backports Release.gpg                                           
Hit 
http://security.ubuntu.com precise-security Release.gpg                                              
Hit 
http://apt.tvheadend.org precise Release.gpg                                           
Get:2 
http://extras.ubuntu.com precise Release.gpg [71 B]                                  
Hit 
http://dl.google.com stable/main i386 Packages                                                  
Hit 
http://us.archive.ubuntu.com precise Release                                           
Get:3 
http://us.archive.ubuntu.com precise-updates Release [49.6 kB]                                     
Hit 
http://security.ubuntu.com precise-security Release                                                  
Ign 
http://dl.google.com stable/main TranslationIndex                                                    
Hit 
http://extras.ubuntu.com precise Release                                                             
Hit 
http://apt.tvheadend.org precise Release                                                          
Hit 
http://security.ubuntu.com precise-security/main Sources                                             
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http://extras.ubuntu.com precise/main Sources                                                    
Hit 
http://apt.tvheadend.org precise/main Sources                                                    
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http://security.ubuntu.com precise-security/main i386 Packages                                       
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http://security.ubuntu.com precise-security/main TranslationIndex                                
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http://security.ubuntu.com precise-security/multiverse TranslationIndex                          
Hit 
http://security.ubuntu.com precise-security/restricted TranslationIndex                          
Hit 
http://extras.ubuntu.com precise/main i386 Packages                                                  
Ign 
http://extras.ubuntu.com precise/main TranslationIndex                                               
Hit 
http://us.archive.ubuntu.com precise-backports Release                                           
Hit 
http://apt.tvheadend.org precise/main i386 Packages                                                  
Ign 
http://apt.tvheadend.org precise/main TranslationIndex                                               
Hit 
http://us.archive.ubuntu.com precise/main Sources                                                    
Hit 
http://us.archive.ubuntu.com precise/restricted Sources                                              
Hit 
http://us.archive.ubuntu.com precise/universe Sources                                                
Hit 
http://us.archive.ubuntu.com precise/multiverse Sources                                              
Hit 
http://us.archive.ubuntu.com precise/main i386 Packages                                              
Hit 
http://us.archive.ubuntu.com precise/restricted i386 Packages                                        
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http://us.archive.ubuntu.com precise/universe i386 Packages                                          
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http://us.archive.ubuntu.com precise/multiverse i386 Packages                                        
Hit 
http://us.archive.ubuntu.com precise/main TranslationIndex                                           
Hit 
http://us.archive.ubuntu.com precise/multiverse TranslationIndex                                     
Hit 
http://us.archive.ubuntu.com precise/restricted TranslationIndex                                     
Hit 
http://us.archive.ubuntu.com precise/universe TranslationIndex                                       
Get:4 
http://us.archive.ubuntu.com precise-updates/main Sources [420 kB]                                 
Ign 
http://dl.google.com stable/main Translation-en_US                                                   
Ign 
http://dl.google.com stable/main Translation-en                                                      
Hit 
http://security.ubuntu.com precise-security/universe TranslationIndex                          
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http://security.ubuntu.com precise-security/main Translation-en                                
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http://security.ubuntu.com precise-security/multiverse Translation-en    
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http://security.ubuntu.com precise-security/restricted Translation-en                          
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http://security.ubuntu.com precise-security/universe Translation-en                            
Ign 
http://extras.ubuntu.com precise/main Translation-en_US                                        
Ign 
http://extras.ubuntu.com precise/main Translation-en                     
Ign 
http://apt.tvheadend.org precise/main Translation-en_US
Ign 
http://apt.tvheadend.org precise/main Translation-en
Get:5 
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Get:6 
http://us.archive.ubuntu.com precise-updates/universe Sources [97.8 kB]
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http://us.archive.ubuntu.com precise-updates/multiverse Sources [8,343 B]
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http://us.archive.ubuntu.com precise-updates/main i386 Packages [715 kB]
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http://us.archive.ubuntu.com precise-updates/multiverse i386 Packages [14.0 kB]                   
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http://us.archive.ubuntu.com precise-updates/main TranslationIndex                                   
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Fetched 1,547 kB in 10s (143 kB/s)                                                                       
Reading package lists... Done
joe@patrickstar:~$ 
checking installation again, as you suggested...
joe@patrickstar:~$ 
joe@patrickstar:~$ dpkg --get-selections | grep tvh 
joe@patrickstar:~$ 
joe@patrickstar:~$ which tvheadend
joe@patrickstar:~$ 
joe@patrickstar:~$ ll /usr/bin/tvheadend
ls: cannot access /usr/bin/tvheadend: No such file or directory
joe@patrickstar:~$ find / -name tvheadend 2>&1 | grep -v 'Permission denied'
joe@patrickstar:~$ 
Not sure what I'm doing wrong... I opened a terminal window to do this install... do I need to cd to a specific directory before I start????  Is there a package that I can install from the Software Center to do this instead???