I would suspect a hw problem, but mint 18 wifi is flawless on the same machine.
Here are the ifconfig results from both boots
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LMDE ifconfig results
eth0 Link encap:Ethernet HWaddr 00:26:6c:d8:aa:f2
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:102 errors:0 dropped:0 overruns:0 frame:0
TX packets:102 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:8888 (8.6 KiB) TX bytes:8888 (8.6 KiB)
wlan0 Link encap:Ethernet HWaddr e0:ca:94:48:41:bc
inet addr:192.168.0.6 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::e2ca:94ff:fe48:41bc/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:443 errors:0 dropped:0 overruns:0 frame:0
TX packets:320 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:57398 (56.0 KiB) TX bytes:37592 (36.7 KiB)
LM 18 ifconfig results
enp6s0 Link encap:Ethernet HWaddr 00:26:6c:d8:aa:f2
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:313 errors:0 dropped:0 overruns:0 frame:0
TX packets:313 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:30223 (30.2 KB) TX bytes:30223 (30.2 KB)
wlp2s0 Link encap:Ethernet HWaddr e0:ca:94:48:41:bc
inet addr:192.168.0.6 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::e2ca:94ff:fe48:41bc/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3902 errors:0 dropped:0 overruns:0 frame:0
TX packets:2716 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:4407215 (4.4 MB) TX bytes:363561 (363.5 KB)