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Today I have tried to update the package lists and I have encountered strange error

$ sudo apt-get update
Ign saucy-security/universe Translation-en_US
Ign saucy-proposed/main Translation-en_US
Ign saucy-proposed/restricted Translation-en_US
Ign saucy-proposed/universe Translation-en_US
Fetched 496 kB in 38s (13.0 kB/s)
E: Unable to change to (unreachable)// - chdir (2: No such file or directory)

What should I change now ? Something in /etc/apt/sources.list ?

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Please see this, – Masroor Nov 7 '13 at 1:35
Can you help me on what should I do in this situation ? – Patryk Nov 7 '13 at 1:49
Is that Saucy installed or Beta version? – Braiam Nov 7 '13 at 1:52
Does not look like I can of much assistance. The only advice we find there is something in the line of not detaching your drive while updating a system. Did you do something like that? If the answer is yes, do you want to try reattaching the drive and running update again? Good luck. – Masroor Nov 7 '13 at 1:54
@Braiam That's Saucy installed. – Patryk Nov 7 '13 at 12:08

I got this error message every time I ran sudo apt-get update with an encrypted home directory, while I was in my home directory.

If I cd'd to / first, the error went away.

(Ubuntu Server 13.10)

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I found my self in a removable disk that I had ejected. Changing into my home folder got me going again. This put me on the right path (literally). – Aeyoun Feb 11 '14 at 23:32
This worked for me on 14.04 Server – Dennis Aug 15 '14 at 13:12
up vote 2 down vote accepted

Reinstalling libapt-pkg helped .

sudo apt-get install --reinstall libapt-pkg4.12
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I had this happen today. It was because my current directory was mounted with sshfs. I don't know if it would occur with any FUSE file system or just sshfs, but the answer was to just get out of that directory. That is:

sudo apt-get update
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