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I have a dual-boot system for Ubuntu 16.04 LTS and windows 8.1. While booting Ubuntu 16.04.3 LTS I get a flickering screen.

I don't know what to do?Can someone help me?

I refereed to one solution in Ubuntu forum and got this from my terminal

$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.3 LTS"
prashanth@prashanth-Inspiron-3541:~$ uname -a
Linux prashanth-Inspiron-3541 4.13.0-45-generic #50~16.04.1-Ubuntu SMP Wed May 30 11:18:27 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
prashanth@prashanth-Inspiron-3541:~$ lspci -nnk|grep -iA2 vga
00:01.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Mullins [Radeon R4/R5 Graphics] [1002:9851]
    Subsystem: Dell Mullins [Radeon R4/R5 Graphics] [1028:0658]
    Kernel modules: radeon, amdgpu
prashanth@prashanth-Inspiron-3541:~$ env |grep DESK
DESKTOP_SESSION=ubuntu
GNOME_DESKTOP_SESSION_ID=this-is-deprecated
XDG_SESSION_DESKTOP=ubuntu
XDG_CURRENT_DESKTOP=Unity

Kindly help me with this issue

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