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I recently upgraded a server version of Ubuntu 16 to Lubuntu 18. I can discover all available WiFi networks but I cannot authenticate at least with two known networks. I am not sure the system has any cached password or conflicting network configuration from Ubuntu 16. Some relevant logs related to this problem are below. Any help is appreciated.

Sep 15 19:05:14 rag-server NetworkManager[1240]: <warn>  [1537034714.7054] dhcp4 (wlp2s0b1): request timed out
Sep 15 19:05:14 rag-server NetworkManager[1240]: <info>  [1537034714.7055] dhcp4 (wlp2s0b1): state changed unknown -> timeout
Sep 15 19:05:14 rag-server NetworkManager[1240]: <info>  [1537034714.7219] dhcp4 (wlp2s0b1): canceled DHCP transaction, DHCP client pid 7745
Sep 15 19:05:14 rag-server NetworkManager[1240]: <info>  [1537034714.7219] dhcp4 (wlp2s0b1): state changed timeout -> done
Sep 15 19:05:14 rag-server NetworkManager[1240]: <info>  [1537034714.7226] device (wlp2s0b1): state change: ip-config -> failed (reason 'ip-config-unavailable', sys-iface-state: 'managed')
Sep 15 19:05:14 rag-server NetworkManager[1240]: <warn>  [1537034714.7245] device (wlp2s0b1): Activation: failed for connection 'rp'
Sep 15 19:05:14 rag-server NetworkManager[1240]: <info>  [1537034714.7345] device (wlp2s0b1): state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed')
Sep 15 19:05:14 rag-server avahi-daemon[1251]: Withdrawing address record for fe80::4201:5623:fc5d:1597 on wlp2s0b1.
Sep 15 19:05:14 rag-server avahi-daemon[1251]: Leaving mDNS multicast group on interface wlp2s0b1.IPv6 with address fe80::4201:5623:fc5d:1597.
Sep 15 19:05:14 rag-server avahi-daemon[1251]: Interface wlp2s0b1.IPv6 no longer relevant for mDNS.
Sep 15 19:05:14 rag-server kernel: [ 1896.027008] wlp2s0b1: deauthenticating from 64:d1:54:63:f2:32 by local choice (Reason: 3=DEAUTH_LEAVING)
Sep 15 19:05:14 rag-server kernel: [ 1896.028874] brcmsmac bcma0:1: brcmsmac: brcms_ops_bss_info_changed: disassociated
Sep 15 19:05:14 rag-server kernel: [ 1896.028885] brcmsmac bcma0:1: brcms_ops_bss_info_changed: qos enabled: false (implement)
Sep 15 19:05:14 rag-server wpa_supplicant[1250]: wlp2s0b1: CTRL-EVENT-DISCONNECTED bssid=64:d1:54:63:f2:32 reason=3 locally_generated=1
Sep 15 19:05:14 rag-server wpa_supplicant[1250]: wlp2s0b1: CTRL-EVENT-REGDOM-CHANGE init=CORE type=WORLD
Sep 15 19:05:14 rag-server NetworkManager[1240]: <warn>  [1537034714.7497] sup-iface[0x563414f86190,wlp2s0b1]: connection disconnected (reason -3)
Sep 15 19:05:14 rag-server NetworkManager[1240]: <info>  [1537034714.7499] device (wlp2s0b1): supplicant interface state: completed -> disconnected

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