$ dpkg-query -l 'linux-headers*' 
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name                              Version                           Description
+++-=================================-=================================-==================================================================================
un  linux-headers                     <none>                            (no description available)
un  linux-headers-2.6                 <none>                            (no description available)
ii  linux-headers-2.6.20-15           2.6.20-15.27                      Header files related to Linux kernel version 2.6.20
ii  linux-headers-2.6.20-15-generic   2.6.20-15.27                      Linux kernel headers for version 2.6.20 on x86/x86_64
ii  linux-headers-2.6.20-16           2.6.20-16.29                      Header files related to Linux kernel version 2.6.20
ii  linux-headers-2.6.20-16-generic   2.6.20-16.29                      Linux kernel headers for version 2.6.20 on x86/x86_64
ii  linux-headers-generic             2.6.20.16.28.1                    Generic Linux kernel headers


$ dpkg-query -l 'glibc*'
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name                              Version                           Description
+++-=================================-=================================-==================================================================================
un  glibc-2.5.0-0exp1                 <none>                            (no description available)
un  glibc-2.5.0-0exp2                 <none>                            (no description available)
un  glibc-doc                         <none>                            (no description available)