我的笔记本电脑（Ubuntu Focal Fossa）里有一个 SD 卡读卡器。
我已插入一个金士顿 SD 内存适配器，其中装有微型 SD。
当我插入它时，我确实听到了“叮”的一声，就像插入 USB 棒一样。
当我连接 USD 棒时，它并没有出现在外部驱动器列表中。
我应该怎么办？
我做到了系统盘：
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 8087:0a2a Intel Corp.
Bus 001 Device 004: ID 0bda:57ed Realtek Semiconductor Corp. USB2.0 VGA UVC WebCam
Bus 001 Device 008: ID 058f:6366 Alcor Micro Corp. Multi Flash Reader
Bus 001 Device 002: ID 0458:6001 KYE Systems Corp. (Mouse Systems) GF3000F Ethernet Adapter
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
然后我做了：sudo lsblk -f
NAME FSTYPE LABEL UUID FSAVAIL FSUSE% MOUNTPOINT
loop0 squashfs 0 100% /snap/chromium/1229
loop1 squashfs 0 100% /snap/chromium/1213
loop2 squashfs 0 100% /snap/core/9436
loop3 squashfs 0 100% /snap/core/9665
loop4 squashfs 0 100% /snap/core18/1754
loop5 squashfs 0 100% /snap/gnome-logs/100
loop6 squashfs 0 100% /snap/core18/1880
loop7 squashfs 0 100% /snap/gedit/537
loop8 squashfs 0 100% /snap/gnome-3-28-1804/128
loop9 squashfs 0 100% /snap/gnome-characters/539
loop10 squashfs 0 100% /snap/gnome-logs/93
loop11 squashfs 0 100% /snap/gnome-calculator/748
loop12 squashfs 0 100% /snap/vlc/1700
loop13 squashfs 0 100% /snap/kde-frameworks-5-core18/32
loop14 squashfs 0 100% /snap/gnome-calculator/730
loop15 squashfs 0 100% /snap/postman/117
loop17 squashfs 0 100% /snap/sublime-text/77
loop18 squashfs 0 100% /snap/gnome-3-34-1804/36
loop19 squashfs 0 100% /snap/gnome-system-monitor/145
loop20 squashfs 0 100% /snap/gnome-3-28-1804/116
loop21 squashfs 0 100% /snap/gedit/605
loop22 squashfs 0 100% /snap/gnome-system-monitor/148
loop23 squashfs 0 100% /snap/sublime-text/85
loop24 squashfs 0 100% /snap/gnome-3-34-1804/33
loop25 squashfs 0 100% /snap/gtk-common-themes/1506
loop26 squashfs 0 100% /snap/gnome-characters/550
loop27 squashfs 0 100% /snap/vlc/1620
loop28 squashfs 0 100% /snap/gtk-common-themes/1502
loop29 squashfs 0 100% /snap/postman/118
sda
├─sda1 vfat 1834-E084 503.2M 2% /boot/efi
└─sda2 ext4 a0c09570-8697-4d16-9f2f-7801a8d95e90 91.4G 75% /
sdb
进而：sudo dmesg | tail -n 50
[29046.947239] sd 3:0:0:0: [sdb] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[29046.947246] sd 3:0:0:0: [sdb] tag#0 Sense Key : Unit Attention [current]
[29046.947251] sd 3:0:0:0: [sdb] tag#0 Add. Sense: Not ready to ready change, medium may have changed
[29046.947255] sd 3:0:0:0: [sdb] tag#0 CDB: Read(10) 28 00 00 00 00 00 00 00 08 00
[29046.947261] blk_update_request: I/O error, dev sdb, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[29046.947270] Buffer I/O error on dev sdb, logical block 0, async page read
[29046.947350] sd 3:0:0:0: [sdb] tag#0 device offline or changed
[29046.947358] blk_update_request: I/O error, dev sdb, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[29046.947361] Buffer I/O error on dev sdb, logical block 0, async page read
[29046.947470] ldm_validate_partition_table(): Disk read failed.
[29046.947513] sd 3:0:0:0: [sdb] tag#0 device offline or changed
[29046.947523] blk_update_request: I/O error, dev sdb, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[29046.947528] Buffer I/O error on dev sdb, logical block 0, async page read
[29046.947668] sd 3:0:0:0: [sdb] tag#0 device offline or changed
[29046.947678] blk_update_request: I/O error, dev sdb, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[29046.947683] Buffer I/O error on dev sdb, logical block 0, async page read
[29046.947824] sd 3:0:0:0: [sdb] tag#0 device offline or changed
[29046.947834] blk_update_request: I/O error, dev sdb, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[29046.947839] Buffer I/O error on dev sdb, logical block 0, async page read
[29046.947977] sd 3:0:0:0: [sdb] tag#0 device offline or changed
[29046.947987] blk_update_request: I/O error, dev sdb, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[29046.947992] Buffer I/O error on dev sdb, logical block 0, async page read
[29046.948096] Dev sdb: unable to read RDB block 0
[29046.948140] sd 3:0:0:0: [sdb] tag#0 device offline or changed
[29046.948148] blk_update_request: I/O error, dev sdb, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[29046.948152] Buffer I/O error on dev sdb, logical block 0, async page read
[29046.948293] sd 3:0:0:0: [sdb] tag#0 device offline or changed
[29046.948302] blk_update_request: I/O error, dev sdb, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[29046.948308] Buffer I/O error on dev sdb, logical block 0, async page read
[29046.948461] sd 3:0:0:0: [sdb] tag#0 device offline or changed
[29046.948471] blk_update_request: I/O error, dev sdb, sector 24 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[29046.948476] Buffer I/O error on dev sdb, logical block 3, async page read
[29046.948619] sd 3:0:0:0: [sdb] tag#0 device offline or changed
[29046.948764] sd 3:0:0:0: [sdb] tag#0 device offline or changed
[29046.948873] sdb: unable to read partition table
[29046.954523] sd 3:0:0:0: [sdb] Attached SCSI removable disk
[29047.002033] sd 3:0:0:0: [sdb] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[29047.002040] sd 3:0:0:0: [sdb] tag#0 Sense Key : Not Ready [current]
[29047.002048] sd 3:0:0:0: [sdb] tag#0 <<vendor>>ASC=0xff <<vendor>>ASCQ=0xff
[29047.002053] sd 3:0:0:0: [sdb] tag#0 CDB: Read(10) 28 00 00 00 00 00 00 00 08 00
[29047.002748] ldm_validate_partition_table(): Disk read failed.
[29047.002761] Dev sdb: unable to read RDB block 0
[29047.003426] sdb: unable to read partition table
[29270.766042] kauditd_printk_skb: 62 callbacks suppressed
[29270.766044] audit: type=1400 audit(1595442783.110:128): apparmor="STATUS" operation="profile_replace" info="same as current profile, skipping" profile="unconfined" name="/snap/core/9665/usr/lib/snapd/snap-confine" pid=20524 comm="apparmor_parser"
[29270.766048] audit: type=1400 audit(1595442783.110:129): apparmor="STATUS" operation="profile_replace" info="same as current profile, skipping" profile="unconfined" name="/snap/core/9665/usr/lib/snapd/snap-confine//mount-namespace-capture-helper" pid=20524 comm="apparmor_parser"
[29271.314599] audit: type=1400 audit(1595442783.658:130): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="snap.postman.postman" pid=20526 comm="apparmor_parser"
[29271.323954] audit: type=1400 audit(1595442783.670:131): apparmor="STATUS" operation="profile_replace" info="same as current profile, skipping" profile="unconfined" name="snap-update-ns.postman" pid=20531 comm="apparmor_parser"
[29271.324358] audit: type=1400 audit(1595442783.670:132): apparmor="STATUS" operation="profile_replace" info="same as current profile, skipping" profile="unconfined" name="snap-update-ns.core" pid=20532 comm="apparmor_parser"
[29271.326252] audit: type=1400 audit(1595442783.670:133): apparmor="STATUS" operation="profile_replace" info="same as current profile, skipping" profile="unconfined" name="snap.core.hook.configure" pid=20533 comm="apparmor_parser"
我确实做了这个建议：echo 1 | sudo tee /sys/bus/pci/rescan