networking - couldn't open interfaces file "/etc/network/interfaces when running ifup wlan0 - Ask Ubuntu

here /etc/network/interfaces file:

auto lo iface lo inet loopback  auto wlan0 iface wlan0 inet dhcp     wpa-ssid myssidhere     wpa-psk mypasshere 

output of iwconfig:

wlp5s0    ieee 802.11abgn  essid:off/any             mode:managed  access point: not-associated   tx-power=off              retry short limit:7   rts thr:off   fragment thr:off           power management:off 

output of iwlist scan: lo interface doesn't support scanning.

enp0s31f6 interface doesn't support scanning.

wlp5s0 failed read scan data : network down

enp4s0 interface doesn't support scanning.

output of ls -al /etc/network/interfaces:

$ ls -al /etc/network/interfaces -rw------- 1 root root 366 nov  3 17:24 /etc/network/interfaces 

error:

~$ sudo ifdown wlp5s0 && sudo ifup -v wlp5s0 rtnetlink answers: no such process internet systems consortium dhcp client 4.3.3 copyright 2004-2015 internet systems consortium. rights reserved. info, please visit https://www.isc.org/software/dhcp/  listening on lpf/wlp5s0/24:ec:99:59:5d:8a sending on   lpf/wlp5s0/24:ec:99:59:5d:8a sending on   socket/fallback configuring interface wlp5s0=wlp5s0 (inet) /bin/run-parts --exit-on-error --verbose /etc/network/if-pre-up.d run-parts: executing /etc/network/if-pre-up.d/ethtool run-parts: executing /etc/network/if-pre-up.d/wireless-tools run-parts: executing /etc/network/if-pre-up.d/wpasupplicant wpa_supplicant: wpa-driver nl80211,wext (default) wpa_supplicant: /sbin/wpa_supplicant -s -b -p /run/wpa_supplicant.wlp5s0.pid -i wlp5s0 -d nl80211,wext -c /run/wpa_supplicant starting /sbin/wpa_supplicant... wpa_supplicant: creating sendsigs omission pidfile: /run/sendsigs.omit.d/wpasupplicant.wpa_supplicant.wlp5s0.pid wpa_supplicant: ctrl_interface socket located @ /run/wpa_supplicant/wlp5s0 wpa_supplicant: configuring network block -- 0 wpa_supplicant: wpa-ssid "tb9jt" -- ok wpa_supplicant: wpa-psk ***** -- ok wpa_supplicant: enabling network block 0 -- ok  /sbin/dhclient -1 -v -pf /run/dhclient.wlp5s0.pid -lf /var/lib/dhcp/dhclient.wlp5s0.leases -i -df /var/lib/dhcp/dhclient6.wlp5s0.leases wlp5s0   internet systems consortium dhcp client 4.3.3 copyright 2004-2015 internet systems consortium. rights reserved. info, please visit https://www.isc.org/software/dhcp/  rtnetlink answers: operation not possible due rf-kill listening on lpf/wlp5s0/24:ec:99:59:5d:8a sending on   lpf/wlp5s0/24:ec:99:59:5d:8a sending on   socket/fallback 

specs

motherboard: asrock h170m lga 1151 usb 3.0 mini itx  cpu: intel core i5-6600 6m skylake quad-core 3.3 ghz lga 1151 ram: crucial 8gb 288-pin ddr4 sdram ddr4 2133 gpu: vga geforce gtx 750 2gb gddr5 pcie hdd: samsung 850 evo 2.5" 250gb sata3 ssd 

what doing wrong here?

as can see, interface not wlan0; wlp5s0. please amend file read:

auto lo iface lo inet loopback  auto wlp5s0 iface wlp5s0 inet dhcp     wpa-ssid myssidhere     wpa-psk mypasshere 

restart interface:

sudo ifdown wlp5s0 && sudo ifup -v wlp5s0 

check:

ping -c3 www.google.com 

you may need correct permissions of file:

sudo chmod 644 /etc/network/interfaces 

check again:

sudo ifdown wlp5s0 && sudo ifup -v wlp5s0