Hash sum mismatch fetching apt data

snapcraft
1

My build failed with the following error for some reason

SystemError: E:Failed to fetch copy:~/.cache/snapcraft/stage-packages/apt/9f556022766dec6938a13bd3c7f93a832c18dc309f860f720b5a14cb050914bad2fa2ce4812618d32fb12bf78b169492/var/lib/apt/lists/partial/tw.archive.ubuntu.com_ubuntu_dists_xenial-security_multiverse_dep11_icons-64x64.tar.gz  Hash Sum mismatch, E:Failed to fetch copy:~/.cache/snapcraft/stage-packages/apt/9f556022766dec6938a13bd3c7f93a832c18dc309f860f720b5a14cb050914bad2fa2ce4812618d32fb12bf78b169492/var/lib/apt/lists/partial/tw.archive.ubuntu.com_ubuntu_dists_xenial-backports_main_dep11_icons-64x64.tar.gz  Hash Sum mismatch, E:Some index files failed to download. They have been ignored, or old ones used instead.

I’ve changed the mirror I used but still encounters it, any ideas? apt update runs perfectly without errors, just snapcraft failing for some reason.

Workaround

Use snapcraft cleanbuild with LXD containers instead

2

The error message seems to imply that the archive is being copied from a local file, which perhaps means the broken file was cached. Have you tried doing a snapcraft clean first?

3

Well I tried rm -r ~/.cache/snapcraft once but it didn’t work, snapcraft clean as well.

I change the source archive to archive.ubuntu.com, still reproduced the same issue.

4

Was the error still referring to tw.archive? If all mirrors have the same broken file with the same checksum, then it must be an actual bad file that was synchronized.

5

Nope the error referring archive.ubuntu.com instead.

6

Do you have a proxy setup?

7

No as well, just a simple NAT to the internet.

8

Okay, so it must be a broken file that was synchronized indeed. It should sort itself out in the next sync. The cleanbuild is likely working because it has a different configuration for apt. I doubt we have multiverse enabled by default there.

9

The problem seems to be solved after I remove the shouldn’t-be-available universe and multiverse components from the security.ubuntu.com archive sourceline.

Here is what’s left in the sources.list:

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
## Software provided at the release
deb http://tw.archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse 
#deb-src http://tw.archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse 

## Regular software fixes after the release
deb http://tw.archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse 
#deb-src http://tw.archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse 

## Security fixes from the SecurityTeam
deb http://security.ubuntu.com/ubuntu/ xenial-security main restricted
#deb-src http://security.ubuntu.com/ubuntu/ xenial-security main restricted 

## Backported Software with less testing
#deb http://tw.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse 
#deb-src http://tw.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse 

## Software provided by Canonical, ltd. and it's partners
deb http://archive.canonical.com/ubuntu xenial partner
#deb-src http://archive.canonical.com/ubuntu xenial partner

I still don’t know why apt update works in the previous configuration though.

10

FYI, I face the same issue as well and commenting out security.ubuntu.com and bionic-proposed archives lines fixed the issued for me.

11

Same problem still happens on a fresh 18.04 install immediately after installing snapcraft and running it for the first time.

E:Failed to fetch copy:/home/al/.cache/snapcraft/stage-packages/apt/8258f62dc19fdf293af3016720501f6a4ab85794b08d971374b77ddc6b7fc8d775345d31004954d4d6f0c3ec59120b14/var/lib/apt/lists/partial/security.ubuntu.com_ubuntu_dists_bionic-security_main_dep11_icons-48x48.tar.gz  Hash Sum mismatch