I have Ubuntu 20.04 linux and I create a second disk, and second filesystem. Right now when I want to see info my second filesystem df is not showing. I use default mount specification.
df -ah
Filesystem Size Used Avail Use% Mounted on
sysfs 0 0 0 - /sys
proc 0 0 0 - /proc
udev 3.9G 0 3.9G 0% /dev
devpts 0 0 0 - /dev/pts
tmpfs 795M 1.6M 794M 1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 49G 13G 34G 27% /
securityfs 0 0 0 - /sys/kernel/security
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
cgroup2 0 0 0 - /sys/fs/cgroup/unified
cgroup 0 0 0 - /sys/fs/cgroup/systemd
pstore 0 0 0 - /sys/fs/pstore
none 0 0 0 - /sys/fs/bpf
cgroup 0 0 0 - /sys/fs/cgroup/freezer
cgroup 0 0 0 - /sys/fs/cgroup/hugetlb
cgroup 0 0 0 - /sys/fs/cgroup/cpu,cpuacct
cgroup 0 0 0 - /sys/fs/cgroup/net_cls,net_prio
cgroup 0 0 0 - /sys/fs/cgroup/pids
cgroup 0 0 0 - /sys/fs/cgroup/memory
cgroup 0 0 0 - /sys/fs/cgroup/devices
cgroup 0 0 0 - /sys/fs/cgroup/blkio
cgroup 0 0 0 - /sys/fs/cgroup/cpuset
cgroup 0 0 0 - /sys/fs/cgroup/perf_event
cgroup 0 0 0 - /sys/fs/cgroup/rdma
systemd-1 0 0 0 - /proc/sys/fs/binfmt_misc
hugetlbfs 0 0 0 - /dev/hugepages
mqueue 0 0 0 - /dev/mqueue
tracefs 0 0 0 - /sys/kernel/tracing
debugfs 0 0 0 - /sys/kernel/debug
configfs 0 0 0 - /sys/kernel/config
fusectl 0 0 0 - /sys/fs/fuse/connections
/dev/loop0 71M 71M 0 100% /snap/lxd/21029
/dev/sda2 976M 299M 610M 33% /boot
/dev/loop1 56M 56M 0 100% /snap/core18/2128
tmpfs 795M 1.6M 794M 1% /run/snapd/ns
/dev/loop4 62M 62M 0 100% /snap/core20/1081
/dev/loop5 68M 68M 0 100% /snap/lxd/21545
nsfs 0 0 0 - /run/snapd/ns/lxd.mnt
/dev/mapper/elk--vg-elk--lv - - - - /mnt/elk
/dev/loop6 62M 62M 0 100% /snap/core20/1169
/dev/loop7 33M 33M 0 100% /snap/snapd/13270
/dev/loop2 33M 33M 0 100% /snap/snapd/13640
/dev/loop8 56M 56M 0 100% /snap/core18/2246
tmpfs 795M 0 795M 0% /run/user/1000
/mnt/elk is my second filesystem and it's showing - - -
UUID=764818a1-03bd-4f7a- /mnt/elk ext4 defaults 0 1
this is my fstab file line
when I switch user root df is showing /mnt/elk filesystem information
df -h
Filesystem Size Used Avail Use% Mounted on
udev 3.9G 0 3.9G 0% /dev
tmpfs 795M 1.6M 794M 1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 49G 13G 34G 27% /
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/loop0 71M 71M 0 100% /snap/lxd/21029
/dev/sda2 976M 299M 610M 33% /boot
/dev/loop1 56M 56M 0 100% /snap/core18/2128
/dev/loop4 62M 62M 0 100% /snap/core20/1081
/dev/loop5 68M 68M 0 100% /snap/lxd/21545
/dev/mapper/elk--vg-elk--lv 196G 13G 174G 7% /mnt/elk
/dev/loop6 62M 62M 0 100% /snap/core20/1169
/dev/loop7 33M 33M 0 100% /snap/snapd/13270
/dev/loop2 33M 33M 0 100% /snap/snapd/13640
/dev/loop8 56M 56M 0 100% /snap/core18/2246
tmpfs 795M 0 795M 0% /run/user/1000
it's look like relevant permission but there is no any restriction
elkas a user? Can you give the output ofmount?/dev/mapper/elk--vg-elk--lv on /mnt/elk type ext4 (rw,relatime)I can see the same line in root userls: cannot open directory '/mnt': Permission denied