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Old 06-27-2014, 08:18 AM   #1
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Can't install mintupdate 4.5.6-1 (Linux Mint 16)

I can't install mintupdate 4.5.6-1 under Linux Mint 16.

When mintupdate tries to upgrade version 4.5.6 to version 4.5.6-1 the following error pops up:

E: Could not open lock file /var/cache/apt/archives/lock - open (21: Is a directory)
E: Could not open file descriptor -1
E: Unable to lock the download directory

I tried “sudo apt-get update”, no joy. I can download the update but I can’t install it. The same error message appears.
What can I do to fix this? Every suggestion is highly appreciated.
Old 06-28-2014, 10:34 AM   #2
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[ i'm pretty sure i answered this yesterday, but it was late at night and maybe i pressed the wrong button, preview instead of submit, who knows... anyhow, everything i wrote is also in the linked forum thread. ]
Old 06-28-2014, 12:00 PM   #3
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"sudo rmdir /var/cache/apt/archives/lock" did the job.

Everything seems to work fine now.

Thanks for your help.
Old 08-12-2014, 05:52 AM   #4
Registered: Feb 2011
Location: The Netherlands
Distribution: Linux Mint 17.2
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I can't install mintupdate 4.5.6-1 under Linux Mint 16.
Mint 16 is obsolete and no longer supported and maintained, not even by the Mint community. It is recommended to upgrade to Mint 17 which is a Long Term Support (LTS) version. Info about upgrading you can find here:


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