@boot0user I agree with you. The best workaround for now is  to update
kernel to Vivid!

# Physical Server (with EFI):
sudo apt-get -y purge linux-{headers,image}-3.16.0-48-generic
sudo apt-get -y install linux-signed-generic-lts-vivid
sudo reboot
uname -r # 3.19.0-26-generic
sudo apt-get -y purge linux-signed-generic-lts-utopic
sudo apt-get -y purge linux-{image,headers}-generic-lts-utopic

# Physical Server (without EFI, but signed is also fine):
sudo apt-get -y purge linux-{headers,image}-3.16.0-48-generic
sudo apt-get -y install linux-generic-lts-vivid
sudo reboot
uname -r # 3.19.0-26-generic
sudo apt-get -y purge linux-generic-lts-utopic
sudo apt-get -y purge linux-{image,headers}-generic-lts-utopic

# Virtual Server:
sudo apt-get -y purge linux-{headers,image,image-extra}-3.16.0-48-generic
sudo apt-get -y install linux-virtual-lts-vivid
sudo reboot
uname -r # 3.19.0-26-generic
sudo apt-get -y purge linux-virtual-lts-utopic
sudo apt-get -y purge linux-{image,headers}-virtual-lts-utopic

# (optional)
# If you want to clean old kernels after the reboot (issue 1267059, 1089195) :
dpkg --get-selections | awk '/linux-(headers|image)-[0-9]\./ { print $1 }' \
| sort -r -V -t- -k3 | tail -n+4 \
| grep -v "$(uname -r | sed -e 's/-generic//')" \
| xargs -r apt-get -qq -y purge

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https://bugs.launchpad.net/bugs/1492146

Title:
  igb Detected Tx Unit Hang

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