We can see the error in Mainlog.txt:
2015-10-08 19:36:18,405 ERROR IOError in cache.commit(): 'Failed to fetch
http://mirror.cov.ukservers.com/ubuntu/pool/main/x/x11-utils/x11-utils_7.7+2build1_amd64.deb
Hash Sum mismatch
'. Retrying (currentTry: 0)
2015-10-08 19:36:19,734 ERROR IOError in cache.commit(): 'Failed to fetch
http://mirror.cov.ukservers.com/ubuntu/pool/main/x/x11-utils/x11-utils_7.7+2build1_amd64.deb
Hash Sum mismatch
'. Retrying (currentTry: 1)
2015-10-08 19:36:21,054 ERROR IOError in cache.commit(): 'Failed to fetch
http://mirror.cov.ukservers.com/ubuntu/pool/main/x/x11-utils/x11-utils_7.7+2build1_amd64.deb
Hash Sum mismatch
'. Retrying (currentTry: 2)
Dmesg.txt seems to indicate some issues with your network connection:
[38502.972517] vmxnet3 0000:03:00.0 eth0: NIC Link is Down
[38508.154793] vmxnet3 0000:03:00.0 eth0: NIC Link is Up 10000 Mbps
[38534.171431] vmxnet3 0000:03:00.0 eth0: NIC Link is Down
[38539.286872] vmxnet3 0000:03:00.0 eth0: NIC Link is Up 10000 Mbps
[38547.329233] vmxnet3 0000:03:00.0 eth0: NIC Link is Down
[38552.488234] vmxnet3 0000:03:00.0 eth0: NIC Link is Up 10000 Mbps
This is something you'll need to investigate manually.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1504252
Title:
upgrade from 14.10 to 15.04 fails: x11-utils_7.7+2build1_amd64.deb
Hash Sum mismatch
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