Problems when installing

[sandrorautenberg]

I was trying to install sparqlify by Linked Data Stack, following the instructions...
I faced the problem when running "sudo apt-get install sparqlify-cli"
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
ttf-dejavu-extra icedtea-netx-common libgif4 tzdata-java libnss3-1d
Use 'apt-get autoremove' to remove them.
The following NEW packages will be installed:
sparqlify-cli
0 upgraded, 1 newly installed, 0 to remove and 5 not upgraded.
Need to get 32.3 MB of archives.
After this operation, 36.5 MB of additional disk space will be used.
Get:1 http://stack.linkeddata.org/deb/ ldstack/main sparqlify-cli all 0.6.17~20150831170718 [32.3 MB]
Fetched 32.3 MB in 33s (973 kB/s)
Failed to fetch http://stack.linkeddata.org/deb/pool/main/s/sparqlify-cli/sparqlify-cli_0.6.17~20150831170718_all.deb Size mismatch
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

Best regards