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I use public wifi in an institute and they have got multiple routers with the same SSID spread throughout the campus. It so happens that often my laptop connects to a router with very weak signal, even though I am sitting very close to another one of the routers with the same SSID (with a very strong signal). Even after I disconnect from the weak network and connect to the strong network manually, the network stops functioning after some time and I have to do the manual reset again.

I have got Ubuntu 14.04 with the following wireless setup:

description: Wireless interface
   product: RT5390 [802.11 b/g/n 1T1R G-band PCI Express Single Chip]
   vendor: Ralink corp.
   physical id: 0
   bus info: pci@0000:07:00.0
   logical name: wlan0
   version: 00
   serial: 84:4b:f5:70:6c:2e
   width: 32 bits
   clock: 33MHz
   capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
   configuration: broadcast=yes driver=rt2800pci driverversion=3.13.0-77-generic firmware=0.34 ip=172.27.30.38 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
   resources: irq:16 memory:c3500000-c350ffff

I tried to change the WLAN sensitivity using the sudo iwconfig wlan0 sens XX command, where I tried various values for XX like -40, 0, 20, etc. The error message displayed is

Error for wireless request "Set Sensitivity" (8B08) : SET failed on device wlan0 ; Operation not supported.

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As suggested by @chili555, Ubuntu connect drops. Worked for a while then started dropping again solves the issue. Essentially, if your wireless is attempting to connect to some undesirable access point, you can force it to connect to the desired AP.

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