It's not exactly the same, but I see the following during reboot, when testing Xubuntu 18.04 daily ISO (2018-04-21), on VirtualBox 4.3 installed on a trusty system.
[ 118.XXXXXX] print_req_error: I/O error, dev sr0, sector 1178984
[ 118.XXXXXX] print_req_error: I/O error, dev loop0, sector 1177462
It's not exactly the same, but I see the following during reboot, when testing Xubuntu 18.04 daily ISO (2018-04-21), on VirtualBox 4.3 installed on a trusty system.
[ 118.XXXXXX] print_req_error: I/O error, dev sr0, sector 1178984
[ 118.XXXXXX] print_req_error: I/O error, dev loop0, sector 1177462
References: cdimage. ubuntu. com/xubuntu/ daily-live/ current/ /www.google. com/search? q=launchpad+ print_req_ error%3A+ I%2FO+error% 2C+dev+ sr0
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