Invisible unmounted partitions

[Ganio]

Hi,
My partitions are not listed anymore in the file manager after some of the last updates.
I also get 'print_req_error: I/O error, dev fd0, sector 0 error' (I don't have floppy) and the pc starts very slowly.
What should I change?

[paxmark1]

What you should change is the amount of information that you provide us. 

Start with output of "inxi -brp"   

convert terminal output to code via the # button.   Copy text from terminal  into between the code   /code xml tags

example of "inxi -a"

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inxi -A
Audio:     Device-1: Intel Xeon E3-1200 v3/4th Gen Core Processor HD Audio driver: snd_hda_intel
           Device-2: Intel 8 Series/C220 Series High Definition Audio driver: snd_hda_intel
           Sound Server: ALSA v: k4.19.0-16-amd64

We should not have to go back to previous posts to get info

[Ganio]

Code Select Expand

System:    Host: s-pc Kernel: 4.19.0-16-amd64 x86_64 bits: 64 Desktop: LXQt 0.14.1 Distro: SparkyLinux 5.14 (Nibiru)
Machine:   Type: Desktop System: FUJITSU SIEMENS product: ESPRIMO E v: N/A serial: <root required>
           Mobo: FUJITSU SIEMENS model: D2264-A2 v: S26361-D2264-A2 serial: <root required> BIOS: FUJITSU SIEMENS // Phoenix
           v: 5.00 R1.07.2264.A2 date: 04/21/2006
CPU:       Dual Core: AMD Athlon 64 X2 3800+ type: MCP speed: 1000 MHz min/max: 1000/2000 MHz
Graphics:  Device-1: NVIDIA GF119 [GeForce GT 610] driver: nvidia v: 390.141
           Display: x11 server: X.Org 1.20.4 driver: nvidia unloaded: fbdev,modesetting,nouveau,vesa
           resolution: 1280x1024~60Hz
           OpenGL: renderer: GeForce GT 610/PCIe/SSE2 v: 4.6.0 NVIDIA 390.141
Network:   Device-1: Realtek RTL8169 PCI Gigabit Ethernet driver: r8169
Drives:    Local Storage: total: 447.14 GiB used: 93.20 GiB (20.8%)
Partition: ID-1: / size: 166.43 GiB used: 93.20 GiB (56.0%) fs: ext4 dev: /dev/sda2
           ID-2: /snap/core/10908 raw size: 99.2 MiB size: <root required> used: <root required> fs: squashfs dev: /dev/loop20
           ID-3: /snap/core/10958 raw size: 99.1 MiB size: <root required> used: <root required> fs: squashfs dev: /dev/loop21
           ID-4: /snap/core18/1988 raw size: 55.5 MiB size: <root required> used: <root required> fs: squashfs
           dev: /dev/loop19
           ID-5: /snap/core18/1997 raw size: 55.4 MiB size: <root required> used: <root required> fs: squashfs
           dev: /dev/loop18
           ID-6: /snap/foliate/1163 raw size: 16.1 MiB size: <root required> used: <root required> fs: squashfs
           dev: /dev/loop22
           ID-7: /snap/foliate/1167 raw size: 16.2 MiB size: <root required> used: <root required> fs: squashfs
           dev: /dev/loop16
           ID-8: /snap/gnome-3-28-1804/145 raw size: 162.9 MiB size: <root required> used: <root required> fs: squashfs
           dev: /dev/loop11
           ID-9: /snap/gnome-3-34-1804/60 raw size: 217.9 MiB size: <root required> used: <root required> fs: squashfs
           dev: /dev/loop10
           ID-10: /snap/gnome-3-34-1804/66 raw size: 219.0 MiB size: <root required> used: <root required> fs: squashfs
           dev: /dev/loop2
           ID-11: /snap/gtk-common-themes/1513 raw size: 64.4 MiB size: <root required> used: <root required> fs: squashfs
           dev: /dev/loop9
           ID-12: /snap/gtk-common-themes/1514 raw size: 64.8 MiB size: <root required> used: <root required> fs: squashfs
           dev: /dev/loop14
           ID-13: /snap/irfanview/28 raw size: 2.5 MiB size: <root required> used: <root required> fs: squashfs
           dev: /dev/loop7
           ID-14: /snap/irfanview/30 raw size: 2.4 MiB size: <root required> used: <root required> fs: squashfs
           dev: /dev/loop1
           ID-15: /snap/notepad-plus-plus/258 raw size: 5.5 MiB size: <root required> used: <root required> fs: squashfs
           dev: /dev/loop13
           ID-16: /snap/notepad-plus-plus/260 raw size: 5.5 MiB size: <root required> used: <root required> fs: squashfs
           dev: /dev/loop12
           ID-17: /snap/snap-store/498 raw size: 51.0 MiB size: <root required> used: <root required> fs: squashfs
           dev: /dev/loop3
           ID-18: /snap/snap-store/518 raw size: 51.0 MiB size: <root required> used: <root required> fs: squashfs
           dev: /dev/loop4
           ID-19: /snap/wine-platform-3-stable/10 raw size: 74.0 MiB size: <root required> used: <root required> fs: squashfs
           dev: /dev/loop6
           ID-20: /snap/wine-platform-3-stable/11 raw size: 99.5 MiB size: <root required> used: <root required> fs: squashfs
           dev: /dev/loop17
           ID-21: /snap/wine-platform-5-stable/13 raw size: 215.5 MiB size: <root required> used: <root required> fs: squashfs
           dev: /dev/loop15
           ID-22: /snap/wine-platform-5-stable/16 raw size: 303.1 MiB size: <root required> used: <root required> fs: squashfs
           dev: /dev/loop5
           ID-23: /snap/wine-platform-runtime/212 raw size: 337.4 MiB size: <root required> used: <root required> fs: squashfs
           dev: /dev/loop8
           ID-24: /snap/wine-platform-runtime/216 raw size: 337.7 MiB size: <root required> used: <root required> fs: squashfs
           dev: /dev/loop0
           ID-25: swap-1 size: 4.88 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/sda3
Repos:     Active apt repos in: /etc/apt/sources.list
           1: deb http://deb.debian.org/debian/ buster main contrib non-free
           2: deb-src http://deb.debian.org/debian/ buster main contrib non-free
           3: deb http://deb.debian.org/debian-security/ buster/updates main contrib non-free
           4: deb-src http://deb.debian.org/debian-security/ buster/updates main contrib non-free
           5: deb http://deb.debian.org/debian/ buster-updates main contrib non-free
           6: deb-src http://deb.debian.org/debian/ buster-updates main contrib non-free
           7: deb http://www.deb-multimedia.org buster main non-free
           No active apt repos in: /etc/apt/sources.list.d/dropbox.list
           Active apt repos in: /etc/apt/sources.list.d/google-chrome.list
           1: deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main
           No active apt repos in: /etc/apt/sources.list.d/liquorix.list
           Active apt repos in: /etc/apt/sources.list.d/sparky.list
           1: deb https://repo.sparkylinux.org/ core main
           2: deb-src https://repo.sparkylinux.org/ core main
           3: deb https://repo.sparkylinux.org/ nibiru main
           4: deb-src https://repo.sparkylinux.org/ nibiru main


[paxmark1]

ID-2: /snap/core/10908 raw size: 99.2 MiB size: <root required> used: <root required> fs: squashfs dev: /dev/loop20

Not sure why there are all those squashfs parttions     I am not sure if most GUI file managers would notice squashfs.   
Wikipedia

Squashfs is a compressed read-only file system for Linux. Squashfs compresses files, inodes and directories, and supports block sizes from 4 KiB up to 1 MiB for greater compression. Several compression algorithms are supported. Squashfs is also the name of free software, licensed under the GPL, for accessing Squashfs filesystems.

Squashfs is intended for general read-only file-system use and in constrained block-device memory systems (e.g. embedded systems) where low overhead is needed.

inxi did not show your DE so I am guessing a tiling WM or Openbox.   

Your hard drive is large enough, I have had smaller storage systems on atoms.  It is real old computer, for an install  I would have just gone with a /    and a  /home    for partitions - both ext4.   And if your memory is 4 GB or less, some would prefer to use 32bit.   

[Ganio]

Hi
Thank you very much for your answer!
I think this Squashfs are from some snaps I've installed.
My problem is that I don't see the other partitions that were visible before some of the last updates. And before that, the PC started much faster.
It's not such a big issue because when it loads, the PC works fine and I can access the partitions in other ways. I just thought there is some easy setting I could adjust to see them listed under devices in the file manager as before.
My DE is LXQt.

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lsblk
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
fd0      2:0    1     4K  0 disk
loop0    7:0    0 337,7M  1 loop /snap/wine-platform-runtime/216
loop1    7:1    0 303,1M  1 loop /snap/wine-platform-5-stable/16
loop2    7:2    0 162,9M  1 loop /snap/gnome-3-28-1804/145
loop3    7:3    0  64,8M  1 loop /snap/gtk-common-themes/1514
loop4    7:4    0  99,5M  1 loop /snap/wine-platform-3-stable/11
loop5    7:5    0   5,5M  1 loop /snap/notepad-plus-plus/260
loop6    7:6    0  99,2M  1 loop /snap/core/10958
loop7    7:7    0  16,2M  1 loop /snap/foliate/1167
loop8    7:8    0   2,4M  1 loop /snap/irfanview/30
loop9    7:9    0   219M  1 loop /snap/gnome-3-34-1804/66
loop10   7:10   0    74M  1 loop /snap/wine-platform-3-stable/10
loop11   7:11   0  99,2M  1 loop /snap/core/10908
loop12   7:12   0 337,4M  1 loop /snap/wine-platform-runtime/212
loop13   7:13   0   5,5M  1 loop /snap/notepad-plus-plus/258
loop14   7:14   0  16,1M  1 loop /snap/foliate/1163
loop15   7:15   0   2,5M  1 loop /snap/irfanview/28
loop16   7:16   0  64,4M  1 loop /snap/gtk-common-themes/1513
loop17   7:17   0  55,5M  1 loop /snap/core18/1997
loop18   7:18   0    51M  1 loop /snap/snap-store/498
loop19   7:19   0    51M  1 loop /snap/snap-store/518
loop20   7:20   0  55,5M  1 loop /snap/core18/1988
loop21   7:21   0 217,9M  1 loop /snap/gnome-3-34-1804/60
loop22   7:22   0 215,5M  1 loop /snap/wine-platform-5-stable/13
sda      8:0    0 298,1G  0 disk
├─sda1   8:1    0  59,6G  0 part
├─sda2   8:2    0 169,6G  0 part /
├─sda3   8:3    0   4,9G  0 part [SWAP]
└─sda4   8:4    0    64G  0 part
sdb      8:16   0 149,1G  0 disk
├─sdb1   8:17   0    30G  0 part
├─sdb2   8:18   0    60G  0 part
├─sdb3   8:19   0  56,3G  0 part
└─sdb4   8:20   0   2,8G  0 part
sr0     11:0    1  1024M  0 rom

Regards