我在 Ubuntu 18.04.1 LTS x64 上，我需要将我的 Qt 5 安装从 v5.9.5 更新到 v5.10.0，但是当我发出命令时
sudo apt-get install qt5-default
它给了我
qt5-default is already at the latest versione (5.9.5+dfsg-0ubuntu1).
但显然这不是真的。我也试过运行：
sudo apt-get update
sudo apt upgrade
sudo apt dist-upgrade
之前，但没有成功。
这些命令有什么问题？我只需要安装没有 UI 的核心库（例如 qtcreator）。
在我的新 PC 上安装 Linux Mint 后，我发现 Wi-Fi 甚至没有显示。
如果我跑步，iwconfig我会得到：
lo no wireless extensions
enp0s20fou1 no wireless extensions
enpls0 no wireless extensions
同时，lspci -nn我得到：
00:00.0 Host bridge [0600]: Intel Corporation Device [8086:5914] (rev 08)
00:02.0 VGA compatible controller [0300]: Intel Corporation Device [8086:5917] (rev 07)
00:04.0 Signal processing controller [1180]: Intel Corporation Skylake Processor Thermal Subsystem [8086:1903] (rev 08)
00:14.0 USB controller [0c03]: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller [8086:9d2f] (rev 21)
00:14.2 Signal processing controller [1180]: Intel Corporation Sunrise Point-LP Thermal subsystem [8086:9d31] (rev 21)
00:15.0 Signal processing controller [1180]: Intel Corporation Sunrise Point-LP Serial IO I2C Controller [8086:9d60] (rev 21)
00:15.1 Signal processing controller [1180]: Intel Corporation Sunrise Point-LP Serial IO I2C Controller [8086:9d61] (rev 21)
00:16.0 Communication controller [0780]: Intel Corporation Sunrise Point-LP CSME HECI [8086:9d3a] (rev 21)
00:17.0 SATA controller [0106]: Intel Corporation Sunrise Point-LP SATA Controller [AHCI mode] [8086:9d03] (rev 21)
00:1c.0 PCI bridge [0604]: Intel Corporation Sunrise Point-LP PCI Express Root Port [8086:9d14] (rev f1)
00:1c.5 PCI bridge [0604]: Intel Corporation Sunrise Point-LP PCI Express Root Port [8086:9d15] (rev f1)
00:1d.0 PCI bridge [0604]: Intel Corporation Device [8086:9d18] (rev f1)
00:1d.3 PCI bridge [0604]: Intel Corporation Device [8086:9d1b] (rev f1)
00:1f.0 ISA bridge [0601]: Intel Corporation Device [8086:9d4e] (rev 21)
00:1f.2 Memory controller [0580]: Intel Corporation Sunrise Point-LP PMC [8086:9d21] (rev 21)
00:1f.3 Audio device [0403]: Intel Corporation Device [8086:9d71] (rev 21)
00:1f.4 SMBus [0c05]: Intel Corporation Sunrise Point-LP SMBus [8086:9d23] (rev 21)
01:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 15)
02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. Device [10ec:b822]
03:00.0 Non-Volatile memory controller [0108]: Device [1c5c:1527]
04:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS522A PCI Express Card Reader [10ec:522a] (rev 01)
在这里，只是网络部分，lspci -nn | grep -i network我得到了
02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. Device [10ec:b822]
最后这是输出inxi -Fxz：
System: Host: HP-ProBook-450-G5 Kernel: 4.10.0-38-generic x86_64 (64 bit gcc: 5.4.0)
Desktop: Cinnamon 3.6.6 (Gtk 3.18.9-1ubuntu3.3) Distro: Linux Mint 18.3 Sylvia
Machine: System: HP (portable) product: HP ProBook 450 G5
Mobo: HP model: 837D v: KBC Version 02.2A.00 Bios: HP v: Q85 Ver. 01.02.05 date: 03/12/2018
CPU: Quad core Intel Core i7-8550U (-HT-MCP-) cache: 8192 KB
flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 15936
clock speeds: max: 4000 MHz 1: 770 MHz 2: 735 MHz 3: 643 MHz 4: 779 MHz 5: 746 MHz 6: 786 MHz
7: 716 MHz 8: 706 MHz
Graphics: Card: Intel Device 5917 bus-ID: 00:02.0
Display Server: X.Org 1.18.4 drivers: intel (unloaded: fbdev,vesa) Resolution: [email protected]
GLX Renderer: Mesa DRI Intel Kabylake GT1.5 GLX Version: 3.0 Mesa 17.0.7 Direct Rendering: Yes
Audio: Card Intel Device 9d71 driver: snd_hda_intel bus-ID: 00:1f.3 Sound: ALSA v: k4.10.0-38-generic
Network: Card-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
driver: r8169 v: 2.3LK-NAPI port: 4000 bus-ID: 01:00.0
IF: enp1s0 state: down mac: <filter>
Card-2: Realtek Device b822 port: 3000 bus-ID: 02:00.0
IF: N/A state: N/A speed: N/A duplex: N/A mac: N/A
Drives: HDD Total Size: NA (-) ID-1: /dev/nvme0n1 model: N/A size: 256.1GB
Partition: ID-1: / size: 219G used: 5.7G (3%) fs: ext4 dev: /dev/nvme0n1p2
ID-2: swap-1 size: 17.07GB used: 0.00GB (0%) fs: swap dev: /dev/nvme0n1p3
RAID: No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors: System Temperatures: cpu: 36.0C mobo: 0.0C
Fan Speeds (in rpm): cpu: N/A
Info: Processes: 230 Uptime: 27 min Memory: 1184.6/15938.7MB Init: systemd runlevel: 5 Gcc sys: 5.4.0
Client: Shell (bash 4.3.481) inxi: 2.2.35
我怎样才能解决这个问题？