I just tried to reproduce your problem on Natty and it is solved there:
spind...@meteor:~$ sudo apt-mark markauto ia32-libs
spind...@meteor:~$ sudo apt-get --simulate install ia32-libs
Reading package lists... Done
Building dependency tree
Reading state information... Done
ia32-libs is already the newest version.
ia32-libs set to manually installed.
The following package was automatically installed and is no longer required:
python-keyring
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
spind...@meteor:~$ sudo apt-get --simulate install ia32-libs
Reading package lists... Done
Building dependency tree
Reading state information... Done
ia32-libs is already the newest version.
ia32-libs set to manually installed.
The following package was automatically installed and is no longer required:
python-keyring
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
spind...@meteor:~$
** Changed in: apt (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/425325
Title:
set to manually installed ignores --simulate in apt-get
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