I have the same problem.
$ uname -a
Linux IT-001 4.4.0-62-generic #83-Ubuntu SMP Wed Jan 18 14:10:15 UTC 2017
x86_64 x86_64 x86_64 GNU/Linux
$ iwconfig
wlan0 IEEE 802.11bgn ESSID:"xxxxxxxxxxxxx"
Mode:Managed Frequency:2.462 GHz Access Point: xxxxxxxxxxxx
Bit Rate=52 Mb/s Tx-Power=20 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:on
Link Quality=70/70 Signal level=-33 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:2173 Invalid misc:4912 Missed beacon:0
$ apt list linux-firmware -a
Listing... Done
linux-firmware/xenial-security,xenial-security,xenial-updates,xenial-updates,now
1.157.8 all [installed,automatic]
linux-firmware/xenial,xenial 1.157 all
My card uses this driver, but I don't think it supports the 5Ghz network
mode. Andrea's workaround does not work for me.
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https://bugs.launchpad.net/bugs/1623022
Title:
Very slow wireless with rt2800pci
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