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I was downloading a package using the terminal. I actually wanted to install package 'A'. But, by mistake started installing package 'B'. I wanted to stop downloading 'B' and start downloading 'A'.

I wasn't able to do that. I reset my network connection. I could stop downloading the package B. But, the administrator directory was locked and wasn't able to download other packages which made me to restart my system.

What command should I use to abort the active download of packages in ubuntu?

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Just to confirm, this is when using apt-get? – 8128 Oct 24 '10 at 8:11
Ya, when using apt-get – Vinay Challuru Oct 25 '10 at 8:33
up vote 9 down vote accepted

have you tried pressing Ctrl+C?

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Only press Ctrl+C when you are downloading. Once it starts installing, it is better to let it finish installing and then uninstall it because cancelling while it is installing can cause broken packages. – dv3500ea Oct 24 '10 at 10:31
Thanks. I will mind it. – Vinay Challuru Oct 25 '10 at 8:34

If you press Ctrl + c while packages are downloading, that's fine. Just don't interrupt an install. Also, remember to use

sudo apt-get autoclean

after you interrupted the package download, so that the downloaded packages don't take up disk space.

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