我有一张 SD 卡（用于 Nintendo Switch），上面存储着屏幕截图。我通常把它们带到我的 MacBook 上传输，而且可以正常工作。但是，它在我的 Ubuntu 18.04 笔记本电脑上不起作用。（快速提示：另一张 SD 卡可以正常工作，所以读卡器没有问题。）
由于我确实听到了插入卡时识别出的声音，所以我做了
tail -f /var/log/syslog
我得到了一份相当大的打印件：
Dec 5 19:48:55 Letsnot kernel: [ 1167.879180] mmc0: new ultra high speed SDR104 SDHC card at address 0001
Dec 5 19:48:55 Letsnot kernel: [ 1167.892962] mmcblk0: mmc0:0001 00000 29.8 GiB
Dec 5 19:48:55 Letsnot kernel: [ 1167.906186] mmcblk0: p1
Dec 5 19:48:55 Letsnot kernel: [ 1167.981342] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:56 Letsnot kernel: [ 1168.273309] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:56 Letsnot kernel: [ 1168.341340] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:56 Letsnot kernel: [ 1168.343214] print_req_error: I/O error, dev mmcblk0, sector 62518144 flags 80700
Dec 5 19:48:56 Letsnot kernel: [ 1168.397365] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:56 Letsnot kernel: [ 1168.399256] print_req_error: I/O error, dev mmcblk0, sector 62518145 flags 80700
Dec 5 19:48:56 Letsnot kernel: [ 1168.453340] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:56 Letsnot kernel: [ 1168.455256] print_req_error: I/O error, dev mmcblk0, sector 62518146 flags 80700
Dec 5 19:48:56 Letsnot kernel: [ 1168.509336] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:56 Letsnot kernel: [ 1168.511212] print_req_error: I/O error, dev mmcblk0, sector 62518147 flags 80700
Dec 5 19:48:56 Letsnot kernel: [ 1168.565331] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:56 Letsnot kernel: [ 1168.567204] print_req_error: I/O error, dev mmcblk0, sector 62518148 flags 80700
Dec 5 19:48:56 Letsnot kernel: [ 1168.621345] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:56 Letsnot kernel: [ 1168.623221] print_req_error: I/O error, dev mmcblk0, sector 62518149 flags 80700
Dec 5 19:48:56 Letsnot kernel: [ 1168.677329] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:56 Letsnot kernel: [ 1168.679202] print_req_error: I/O error, dev mmcblk0, sector 62518150 flags 80700
Dec 5 19:48:56 Letsnot kernel: [ 1168.733341] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:56 Letsnot kernel: [ 1168.735217] print_req_error: I/O error, dev mmcblk0, sector 62518151 flags 80700
Dec 5 19:48:56 Letsnot kernel: [ 1168.789327] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:56 Letsnot kernel: [ 1168.845332] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:56 Letsnot kernel: [ 1168.901342] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:56 Letsnot kernel: [ 1168.903225] print_req_error: I/O error, dev mmcblk0, sector 62518144 flags 0
Dec 5 19:48:56 Letsnot kernel: [ 1168.957272] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:56 Letsnot kernel: [ 1168.959155] print_req_error: I/O error, dev mmcblk0, sector 62518145 flags 0
Dec 5 19:48:56 Letsnot kernel: [ 1169.013324] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:57 Letsnot kernel: [ 1169.069330] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:57 Letsnot kernel: [ 1169.125336] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:57 Letsnot kernel: [ 1169.181342] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:57 Letsnot kernel: [ 1169.237324] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:57 Letsnot kernel: [ 1169.293344] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:57 Letsnot kernel: [ 1169.295244] Buffer I/O error on dev mmcblk0, logical block 7814768, async page read
Dec 5 19:48:57 Letsnot kernel: [ 1169.409343] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:57 Letsnot kernel: [ 1169.465323] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:57 Letsnot kernel: [ 1169.521334] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:57 Letsnot kernel: [ 1169.577281] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:57 Letsnot kernel: [ 1169.633317] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:57 Letsnot kernel: [ 1169.689335] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:57 Letsnot kernel: [ 1169.745301] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:57 Letsnot kernel: [ 1169.801328] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:57 Letsnot kernel: [ 1169.857257] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:57 Letsnot kernel: [ 1169.913336] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:57 Letsnot kernel: [ 1169.969234] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:57 Letsnot kernel: [ 1170.025298] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:58 Letsnot kernel: [ 1170.081274] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:58 Letsnot kernel: [ 1170.137301] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:58 Letsnot kernel: [ 1170.193326] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:58 Letsnot kernel: [ 1170.249267] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:58 Letsnot kernel: [ 1170.305321] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:58 Letsnot kernel: [ 1170.361309] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:58 Letsnot kernel: [ 1170.417317] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:58 Letsnot kernel: [ 1170.473315] mmc0: Tuning timeout, falling back to fixed sampling clock
Dec 5 19:48:58 Letsnot kernel: [ 1170.475240] Buffer I/O error on dev mmcblk0p1, logical block 7813744, async page read
谷歌搜索部分内容，我得到的答案是 SD 卡已损坏且无可救药地丢失。但是，它在 Switch 和 MacBook 上仍然可以正常工作。所以我真的很好奇为什么会出现这个错误。
另外需要注意的是，新近格式化的 exfat SD 卡（也适用于 Nintendo Switch）运行良好，因此读卡器本身没有问题。