Sayantan Das, thank you for reporting this and helping make Ubuntu better. The stacktrace you posted is graphics related, versus network. However, graphics crashes can be quite ugly in the collateral issues that result from them.
Despite this, as per http://support.lenovo.com/us/en/products/laptops- and-netbooks/flex-series/flex-2-14-notebook-lenovo an update to your computer's buggy and outdated BIOS is available (A0CN35WW). If you update to this following https://help.ubuntu.com/community/BIOSUpdate does it change anything? If it doesn't, could you please both specify what happened, and provide the output of the following terminal command: sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date For more on BIOS updates and linux, please see https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette . Please note your current BIOS is already in the Bug Description, so posting this on the old BIOS would not be helpful. As well, you don't have to create a new bug report. Once the BIOS is updated, and the information above is provided, then please mark this report Status Confirmed. Thank you for your understanding. ** Tags removed: bios-outdated-a3cn32ww ** Tags added: bios-outdated-a0cn35ww ** Changed in: linux (Ubuntu) Importance: Undecided => Low ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1445775 Title: RTL8723BE throws stack trace in kernel 3.19 and disconnects To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1445775/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
