联想 ThinkPad W520 上的 Ubuntu 22.04。我#认为#我在 /media/claus 上安装了一个外部磁盘，终端找到了它。在我的侧边栏中，应该代表它的“500 GB 卷”符号却显示“文件夹为空”。
在尝试理清这个问题时，我发现我的系统中存在一些奇怪的事情。“mount”告诉我 sda5 已链接两次，一次在“/”上，一次在 /var/snap/firefox 上... 这听起来很奇怪。
然后，sda 1 安装在 /boot/efi 上，当我尝试使用 sudo cd 转到那里时，出现“未找到命令”“cd 是 shell 内置命令，不能直接运行” - 不管这意味着什么。
我的 SD 卡安装在 /media/claus 上，可以正常工作，但它在终端中的名称是 deb4033-6c02-，还有 20 多个以 1 结尾的字符，除了“1”之外，其他都与安装在此处的另一个驱动器相同，是空的。这张卡在我的侧边栏中显示为“249GB 卷”。
然后，sdb 安装在 /media/claus 上，显示为“ExternMusic”，这正是我想要的，但尽管我可以通过终端访问它，我的 DAW 也能找到它，但它并没有出现在我期望的桌面侧面板中。我有 2013 年的“Linux 命令行”第二版互联网版，但我在那里找不到任何可以帮助我摆脱这种情况的东西。
我从哪里可以找到帮助部分？在更新到 22 之前，我尝试备份我的音乐，我怀疑我把事情完全搞砸了。请帮忙。
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
udev on /dev type devtmpfs (rw,nosuid,relatime,size=8031516k,nr_inodes=2007879,mode=755,inode64)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,nodev,noexec,relatime,size=1613964k,mode=755,inode64)
/dev/sda5 on / type ext4 (rw,relatime,errors=remount-ro)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev,inode64)
tmpfs on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k,inode64)
cgroup2 on /sys/fs/cgroup type cgroup2 (rw,nosuid,nodev,noexec,relatime,nsdelegate,memory_recursiveprot)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
bpf on /sys/fs/bpf type bpf (rw,nosuid,nodev,noexec,relatime,mode=700)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=29,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=17312)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,pagesize=2M)
mqueue on /dev/mqueue type mqueue (rw,nosuid,nodev,noexec,relatime)
debugfs on /sys/kernel/debug type debugfs (rw,nosuid,nodev,noexec,relatime)
tracefs on /sys/kernel/tracing type tracefs (rw,nosuid,nodev,noexec,relatime)
fusectl on /sys/fs/fuse/connections type fusectl (rw,nosuid,nodev,noexec,relatime)
configfs on /sys/kernel/config type configfs (rw,nosuid,nodev,noexec,relatime)
ramfs on /run/credentials/systemd-sysusers.service type ramfs (ro,nosuid,nodev,noexec,relatime,mode=700)
/var/lib/snapd/snaps/bare_5.snap on /snap/bare/5 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/var/lib/snapd/snaps/core18_2785.snap on /snap/core18/2785 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/var/lib/snapd/snaps/core18_2812.snap on /snap/core18/2812 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/var/lib/snapd/snaps/core20_2105.snap on /snap/core20/2105 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/var/lib/snapd/snaps/core20_2182.snap on /snap/core20/2182 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/var/lib/snapd/snaps/core22_1033.snap on /snap/core22/1033 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/var/lib/snapd/snaps/core22_1122.snap on /snap/core22/1122 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/var/lib/snapd/snaps/firefox_3687.snap on /snap/firefox/3687 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/var/lib/snapd/snaps/firefox_3836.snap on /snap/firefox/3836 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/var/lib/snapd/snaps/gnome-3-38-2004_140.snap on /snap/gnome-3-38-2004/140 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/var/lib/snapd/snaps/gnome-3-38-2004_143.snap on /snap/gnome-3-38-2004/143 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/var/lib/snapd/snaps/gnome-42-2204_120.snap on /snap/gnome-42-2204/120 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/var/lib/snapd/snaps/gnome-42-2204_141.snap on /snap/gnome-42-2204/141 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/var/lib/snapd/snaps/gtk-common-themes_1535.snap on /snap/gtk-common-themes/1535 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/var/lib/snapd/snaps/snap-store_638.snap on /snap/snap-store/638 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/var/lib/snapd/snaps/snap-store_959.snap on /snap/snap-store/959 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/var/lib/snapd/snaps/snapd_19457.snap on /snap/snapd/19457 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/var/lib/snapd/snaps/snapd_20671.snap on /snap/snapd/20671 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/var/lib/snapd/snaps/snapd-desktop-integration_57.snap on /snap/snapd-desktop-integration/57 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/var/lib/snapd/snaps/snapd-desktop-integration_83.snap on /snap/snapd-desktop-integration/83 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/var/lib/snapd/snaps/vlc_3078.snap on /snap/vlc/3078 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/dev/sda5 on /var/snap/firefox/common/host-hunspell type ext4 (ro,noexec,noatime,errors=remount-ro)
/var/lib/snapd/snaps/vlc_3721.snap on /snap/vlc/3721 type squashfs (ro,nodev,relatime,errors=continue,threads=single,x-gdu.hide)
/dev/sda1 on /boot/efi type vfat (rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,nosuid,nodev,noexec,relatime)
tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,relatime,size=1613960k,nr_inodes=403490,mode=700,uid=1000,gid=1000,inode64)
portal on /run/user/1000/doc type fuse.portal (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000)
gvfsd-fuse on /run/user/1000/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000)
tmpfs on /run/snapd/ns type tmpfs (rw,nosuid,nodev,noexec,relatime,size=1613964k,mode=755,inode64)
nsfs on /run/snapd/ns/snapd-desktop-integration.mnt type nsfs (rw)
/dev/mmcblk0p1 on /media/claus/deb4033b-6c02-4efc-af05-c7fc4b8473e51 type ext4 (rw,nosuid,nodev,relatime,errors=remount-ro,uhelper=udisks2)
/dev/sdb on /media/claus/6df32c8d-5c37-445d-b973-e3b887151062 type ext4 (rw,nosuid,nodev,relatime,errors=remount-ro,uhelper=udisks2)
nsfs on /run/snapd/ns/snap-store.mnt type nsfs (rw)
nsfs on /run/snapd/ns/firefox.mnt type nsfs (rw)
claus@StudioBox:~$