This is very strange. I made the .tar.gz on my system and used 'tar -zxvf gladex-0.3.4.tar.gz'; it worked fine. I then uploaded the file to Launchpad. I then downloaded the file back to my computer. I then used 'tar -zxvf gladex-0.3.4.tar.gz' on this new file. I get the same output as you:
"""
gzip: stdin: not in gzip format
tar: Child returned status 1
tar: Error exit delayed from previous errors
"""
This is very strange. I made the .tar.gz on my system and used 'tar -zxvf gladex- 0.3.4.tar. gz'; it worked fine. I then uploaded the file to Launchpad. I then downloaded the file back to my computer. I then used 'tar -zxvf gladex- 0.3.4.tar. gz' on this new file. I get the same output as you:
"""
gzip: stdin: not in gzip format
tar: Child returned status 1
tar: Error exit delayed from previous errors
"""
It seems to be related to bug #44773 (https:/ /bugs.launchpad .net/launchpad/ +bug/44773). I'll make a post there referencing this bug