360 usb wifi 3的驱动怎么安装？

查查无线芯片是什么， 如果 linux 内核支持，而树莓派没有把这芯片选上（模组或者内置）的话，你需要重新设定/编译内核，安装内核以及模组。
可以不管什么，先插上，然后运行
sudo dmesg 看看

dmesg 结果是已经认出来了，应该不会有什么大的麻烦。
[ 64.974517] usb 1-1.2: new high-speed USB device number 5 using dwc_otg
[ 65.105713] usb 1-1.2: New USB device found, idVendor=0e8d, idProduct=760c, bcdDevice= 0.01
[ 65.105770] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 65.105799] usb 1-1.2: Product: 802.11 n WLAN
[ 65.105821] usb 1-1.2: Manufacturer: MediaTek
[ 65.105842] usb 1-1.2: SerialNumber: 1.0
sudo ifconfig -a 看看
把无线相关的包装上，如 iw, wpa_supplicant 等等，把 /etc/network/interfaces 改改，把
/etc/wpa_supplicant/wpa_supplicant.conf 之类改改，然后
sudo ifup wlan0
估计就差不离了。

另外可能需要加装的包： wireless-tools
还有 Mediatek 的 firmware, 至少我用 mt7601u 的时候是需要的，估计 mt7603u 也差不多。
包的名字是 firmware-misc-nonfree，可能需要改 /etc/apt/sources.list 加上 non-free 选项。

你用不着自己编译，只要安装相应的包，改改配置，然后 ifup 之类就起来了。反正我用 mt7601u 是不自己编译的。
pi@testworks:/lib/modules/4.19.66+/kernel/drivers/net/wireless/mediatek $ uname -a
Linux testworks 4.19.66+ #1253 Thu Aug 15 11:37:30 BST 2019 armv6l GNU/Linux
pi@testworks:/lib/modules/4.19.66+/kernel/drivers/net/wireless/mediatek $ ls -lR
.:
total 8
drwxr-xr-x 3 root root 4096 Dec 28 2020 mt76
drwxr-xr-x 2 root root 4096 Dec 28 2020 mt7601u
./mt76:
total 176
-rw-r--r-- 1 root root 51596 Aug 19 2019 mt76.ko
-rw-r--r-- 1 root root 33064 Aug 19 2019 mt76-usb.ko
drwxr-xr-x 2 root root 4096 Dec 28 2020 mt76x0
-rw-r--r-- 1 root root 48644 Aug 19 2019 mt76x2-common.ko
-rw-r--r-- 1 root root 36056 Aug 19 2019 mt76x2u.ko
./mt76/mt76x0:
total 132
-rw-r--r-- 1 root root 131644 Aug 19 2019 mt76x0.ko
./mt7601u:
total 132
-rw-r--r-- 1 root root 132584 Aug 19 2019 mt7601u.ko
pi@testworks:/lib/modules/4.19.66+/kernel/drivers/net/wireless/mediatek $

估计够呛。现在的内核很挑剔的，次要版本不一致都可能不能用。
其实另一种解决办法是：换一个能直接支持的无线网卡，现在这东西太便宜了，不值得花精力。

https://wireless.wiki.kernel.org/en/users/drivers/mediatek
好像 mt7603 属于那些不被内核支持的 “Any other MediaTek chips.”
Introduction
mac80211 wireless driver for MediaTek MT7xxx series
mt76 driver handles:
MT7610U 802.11a/b/g/n/ac 1T1R 2.4/5GHz USB Chip
MT7612/MT7602/MT7662 802.11a/b/g/n/ac 2T2R 2.4/5GHz PCIe/USB Chip
MT7630E 802.11a/b/g/n 1T1R 2.4/5GHz PCIe Chip
MT7610E 802.11a/b/g/n/ac 1T1R 2.4/5GHz PCIe Chip
MT7603E 802.11b/g/n 2T2R 2.4GHz PCIe chip and MT7628 802.11b/g/n 2T2R 2.4GHz SoC Device (4.7+)
MT7615 802.11a/b/g/n/ac 4T4R 2.4/5GHz PCIe Chip (5.2+)
MT7622 802.11b/g/n 4T4R 2.4GHz SoC Device (5.7+)
MT7663 802.11a/b/g/n/ac 2T2R 2.4/5GHz PCIe/USB/SDIO Chip (5.8+)
MT7915 802.11a/b/g/n/ac/ax 4T4R 2.4/5GHz PCIe Chip (5.9+)
MT7921 802.11a/b/g/n/ac/ax 2T2R 2.4/5GHz/6Hz PCIe/USB/SDIO Chip
MT7921 PCIe is supported since (5.12+)
MT7921 SDIO is supported since (5.16+)
MT7921 USB is supported since (5.18+)
6G band is supported by MT7921K
MT7922 802.11a/b/g/n/ac/ax 2T2R 2.4/5G/6GHz PCIe Chip (5.16+)
mt7601u driver handles:
MT7601U 802.11b/g/n 1T1R 2.4GHz USB Chip
note: 5Ghz MT7613BEN is handled as a mt7663 case (ChipID=0x7663) which is handled by mt7615 driver. Openwrt Archer c6 v3 uses it.
Unsupported chips
Any other MediaTek chips.
Firmware
You can get the latest firmware from linux-firmware.git
Developers & Support
Send patches to the people and mailing lists below:
To: Felix Fietkau nbd@nbd.name
To: Lorenzo Bianconi lorenzo@kernel.org
To: Ryder Lee ryder.lee@mediatek.com
To: Shayne Chen shayne.chen@mediatek.com
To: Sean Wang sean.wang@mediatek.com
To: Deren Wu deren.wu@mediatek.com
Cc: linux-mediatek@lists.infradead.org - https://lists.infradead.org/mailman/listinfo/linux-mediatek
Cc: linux-wireless@vger.kernel.org - http://vger.kernel.org/vger-lists.html#linux-wireless
IRC channel: #mt76-devel