Hi! The second link does not have the iwlwifi-7260-12.ucode file. Without that 
installed, I got the following  message in  /var/log/syslog: 
Mar  6 18:48:07 Dell kernel: [    3.448905] iwlwifi 0000:08:00.0: Direct 
firmware load for iwlwifi-7260-12.ucode failed with error -2
Mar  6 18:48:07 Dell kernel: [    3.448917] Request for unknown module key 
'Magrathea: Glacier signing key: 007271576a09d86ef244371b0633e47abb75b89d' err 
-11
Mar  6 18:48:07 Dell kernel: [    3.449744] iwlwifi 0000:08:00.0: Direct 
firmware load for iwlwifi-7260-11.ucode failed with error -2
Mar  6 18:48:07 Dell kernel: [    3.455385] iwlwifi 0000:08:00.0: loaded 
firmware version 23.11.10.0 op_mode iwlmvm

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https://bugs.launchpad.net/bugs/1335475

Title:
  8086:08b1 (rev 73) [Dell Vostro 5470] WiFi keeps dropping

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