I tried to figure out the cause by myself and saw good people here usually asked a few command's output as part of diagnosis when someone is in trouble with identical scenario. Based on that, I'm putting here are a few command's output. Let me know if I need to run something else.
inxi -Fxz
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System: Host: mahfuz-Inspiron-N5110 Kernel: 4.15.0-29-generic x86_64 (64 bit gcc: 5.4.0)
Desktop: Cinnamon 3.6.7 (Gtk 3.18.9-1ubuntu3.3) Distro: Linux Mint 18.3 Sylvia
Machine: System: Dell (portable) product: Inspiron N5110
Mobo: Dell model: 0FXK2Y v: A09 Bios: Dell v: A09 date: 09/30/2011
CPU: Dual core Intel Core i5-2450M (-HT-MCP-) cache: 3072 KB
flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 9977
clock speeds: max: 3100 MHz 1: 798 MHz 2: 798 MHz 3: 798 MHz 4: 798 MHz
Graphics: Card-1: Intel 2nd Generation Core Processor Family Integrated Graphics Controller bus-ID: 00:02.0
Card-2: NVIDIA GF108M [GeForce GT 525M] bus-ID: 01:00.0
Display Server: X.Org 1.18.4 drivers: intel (unloaded: fbdev,vesa) FAILED: nouveau
Resolution: 1920x1080@59.96hz
GLX Renderer: Mesa DRI Intel Sandybridge Mobile GLX Version: 3.0 Mesa 18.0.5 Direct Rendering: Yes
Audio: Card-1 NVIDIA GF108 High Definition Audio Controller driver: snd_hda_intel bus-ID: 01:00.1
Card-2 Intel 6 Series/C200 Series Family High Definition Audio Controller
driver: snd_hda_intel bus-ID: 00:1b.0
Sound: Advanced Linux Sound Architecture v: k4.15.0-29-generic
Network: Card-1: Realtek RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller
driver: r8169 v: 2.3LK-NAPI port: d000 bus-ID: 05:00.0
IF: enp5s0 state: up speed: 100 Mbps duplex: full mac: <filter>
Card-2: Broadcom BCM4313 802.11bgn Wireless Network Adapter bus-ID: 09:00.0
IF: N/A state: N/A mac: N/A
Drives: HDD Total Size: 594.4GB (95.0% used) ID-1: /dev/sda model: WDC_WD5000BPVT size: 500.1GB
ID-2: USB /dev/sdb model: SanDisk_Ultra size: 63.2GB ID-3: USB /dev/sdc model: Ultra size: 31.1GB
Partition: ID-1: / size: 25G used: 20G (86%) fs: ext4 dev: /dev/sda3
RAID: No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors: System Temperatures: cpu: 59.0C mobo: N/A
Fan Speeds (in rpm): cpu: N/A
Info: Processes: 248 Uptime: 1:34 Memory: 4489.9/7883.0MB Init: systemd runlevel: 5 Gcc sys: 5.4.0
Client: Shell (bash 4.3.481) inxi: 2.2.35
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0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
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enp5s0 no wireless extensions.
lo no wireless extensions.
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Linux 4.15.0-29-generic
Thanks in advance!