When I run apt-get update, I get the following:


The following packages have unmet dependencies:
libbullet2.79-dev : Depends: libbullet2.79 (= 2.79.1-ubuntu1~natty1) but it is not installed
E: Unmet dependencies. Try using -f.


Running apt-get -f install returns the following:

Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following packages were automatically installed and are no longer required:
libkastencore4 liboktetagui4 linux-headers-2.6.38-8
chromium-browser-inspector libkastengui4 liboktetakastencontrollers4
libqjson0 libkastencontrollers4 liboktetakastengui4
linux-headers-2.6.38-8-generic liboktetakastencore4 liboktetacore4
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
libbullet2.79
The following NEW packages will be installed:
libbullet2.79
0 upgraded, 1 newly installed, 0 to remove and 56 not upgraded.
2 not fully installed or removed.
Need to get 0 B/943 kB of archives.
After this operation, 2,392 kB of additional disk space will be used.
Do you want to continue [Y/n]? y
(Reading database ... 234600 files and directories currently installed.)
Unpacking libbullet2.79 (from .../libbullet2.79_2.79.1-ubuntu1~natty1_i386.deb) ...
dpkg: error processing /var/cache/apt/archives/libbullet2.79_2.79.1-ubuntu1~natty1_i386.deb (--unpack):
trying to overwrite '/usr/lib/libBulletCollision.so', which is also in package libbullet 2.78-0
Errors were encountered while processing:
/var/cache/apt/archives/libbullet2.79_2.79.1-ubuntu1~natty1_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

Any idea why this isn't working? I've tried apt-get clean all as well but it didn't help.

Do you have 'libbullet 2.78-0' installed?

If you don't, then simply remove the offending library '/usr/lib/libBulletCollision.so' and re-run apt.

I removed that library, did apt-get clean all and then apt-get -f install, but got the same error.

Hmm, strange.

Do 'dpkg -l | grep bullet' to make sure there isn't libbullet 2.78-0.

Also, is libBulletCollision.so actually present in /usr/lib/ now? If it is, is its modification time the same time you did the last install attempt at?

I made sure I removed the old version of libbullet with dpkg and then purged it. Then I restarted, ran apt-get clean all and apt-get -f install and that fixed it. Thanks for the help!