$ 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)