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I try to install gcc4.9 on Ubuntu 14.04 and run:

sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update

with following error:

...
W: Failed to fetch http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu/dists/trusty/main/binary-amd64/Packages  Hash Sum mismatch
E: Some index files failed to download. They have been ignored, or old  ones used instead

I type http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu/dists/trusty/main/binary-amd64/Packages into the browser getting 'not found' reply.

try to install anymore:

sudo apt-get install gcc-4.9

with following:

Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 gcc-4.9:i386 : Depends: cpp-4.9:i386 (= 4.9.4-2ubuntu1~14.04.1) but it is not going to be installed
                Depends: gcc-4.9-base:i386 (= 4.9.4-2ubuntu1~14.04.1) but it is not going to be installed
                Depends: binutils:i386 (>= 2.24) but it is not going to be installed
                Depends: libgcc-4.9-dev:i386 (= 4.9.4-2ubuntu1~14.04.1) but it is not going to be installed
                Depends: libc6:i386 (>= 2.11) but it is not going to be installed
                Depends: libcloog-isl4:i386 (>= 0.17) but it is not going to be installed
                Depends: libgmp10:i386 but it is not installable
                Depends: libisl15:i386 (>= 0.15) but it is not going to be installed
                Depends: libmpc3:i386 but it is not installable
                Depends: libmpfr4:i386 (>= 3.1.3) but it is not going to be installed
                Depends: zlib1g:i386 (>= 1:1.1.4) but it is not installable
                Recommends: libc6-dev:i386 (>= 2.13-0ubuntu6) but it is not going to be installed

Trouble downloading packages list due to a "Hash sum mismatch" error --this doesn't work to me.

Any suggestions will be great to me:-)

Community
  • 1
Johnson Lai
  • 101

1 Answers1

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if you trim the url back to the folder like this

http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu/dists/trusty/main/binary-amd64/

then it works in the browser and you can see that there is a gzip and bzip2 compressed copy of the Packages file. You could download this file and put it in /var/cache/apt/archives/list or /var/cache/apt/archives/ it might skip the failing step.

update: looking at the ppa's page i can see there is another link that will work better , try this 

sudo add-apt-repository ppa:ubuntu-toolchain-r/ppa
Amias
  • 5,359