Try ls -ld ~/exportedshare on server. If the chomwitt account has write access to the directory it will be able to delete files in it even if it can't do anything else to them. This is one of the non-intuitive quirks of how UNIX file permissions work.

You could prevent it with chattr +i text.txt if you really needed to.

df -i to see how many inodes are used in each filesystem would also be worthwhile. Although you are not very likely to run out on a new install.

That confirms my suspicion from the error message that it's a perl script. But I don't know enough about package formatting to offer any more help. Sorry.

After cd /usr/share/images/desktop-base/ run ls -l which should show you the files in that directory.

As a new user the first command I recommend to you is man (short for manual). It tells you how to use commands.
Start with man less (less is the program man uses to display its output). Then man man and man ls (man cd won't work because cd is part of your shell (probably bash).

A good rule is that whenever someone recommends a command you are not familiar with always read it's man page before running it. It can prevent unpleasant surprises.

My first two thoughts would be:
rm ~/.xsession-errors;ln -s /dev/null ~/.xsession-errors # Send it somewhere harmless.
or
>~/.xsession-errors; sudo chown root:root ~/.xsession-errors;sudo chattr -i ~/.xsession-errors # Truncate file, then make it totally unwriteable.

First try host deb.devuan.org which should give something like this:

deb.devuan.org is an alias for deb.rr.devuan.org.
deb.rr.devuan.org has address 160.16.137.156
deb.rr.devuan.org has address 5.9.122.185
deb.rr.devuan.org has address 185.178.192.43
deb.rr.devuan.org has address 198.58.118.8
deb.rr.devuan.org has address 114.34.81.84
deb.rr.devuan.org has address 94.16.114.15
deb.rr.devuan.org has address 185.236.240.103
deb.rr.devuan.org has address 5.161.180.234
deb.rr.devuan.org has address 67.219.104.166
deb.rr.devuan.org has address 23.169.200.138
deb.rr.devuan.org has address 147.229.176.19
deb.rr.devuan.org has address 152.53.121.155
deb.rr.devuan.org has address 131.188.12.211
deb.rr.devuan.org has address 147.78.194.22
deb.rr.devuan.org has address 195.85.215.180
deb.rr.devuan.org has address 103.146.168.12
deb.rr.devuan.org has address 95.216.15.86
deb.rr.devuan.org has address 200.236.31.1
deb.rr.devuan.org has address 46.4.50.2
deb.rr.devuan.org has address 130.225.254.116
deb.rr.devuan.org has address 141.84.43.19
deb.rr.devuan.org has address 190.64.49.124
deb.rr.devuan.org has IPv6 address 2001:e42:102:1704:160:16:137:156
deb.rr.devuan.org has IPv6 address 2a01:4f8:162:7293::14
deb.rr.devuan.org has IPv6 address 2a03:4000:28:24c::
deb.rr.devuan.org has IPv6 address 2a0d:eb00:8006::acab
deb.rr.devuan.org has IPv6 address 2a01:4ff:f0:dd3a::1
deb.rr.devuan.org has IPv6 address 2401:c080:2000:229e:4b70:fe82:36ed:f788
deb.rr.devuan.org has IPv6 address 2602:817:2000:401::138
deb.rr.devuan.org has IPv6 address 2001:67c:1220:8b0::93e5:b013
deb.rr.devuan.org has IPv6 address 2a0a:4cc0:c0:4676:4242:4242:4242:4242
deb.rr.devuan.org has IPv6 address 2001:638:a000:1021:21::1
deb.rr.devuan.org has IPv6 address 2a0a:e5c0:10:3::6eeb
deb.rr.devuan.org has IPv6 address 2a01:9e40::180
deb.rr.devuan.org has IPv6 address 2407:b6c0::12
deb.rr.devuan.org has IPv6 address 2a01:4f9:2a:fa9::2
deb.rr.devuan.org has IPv6 address 2801:82:80ff:8000::2
deb.rr.devuan.org has IPv6 address 2a01:4f8:140:1102:2b76:955d:b48f:bdf3
deb.rr.devuan.org has IPv6 address 2001:878:346::116
deb.rr.devuan.org has IPv6 address 2001:4ca0:4300::1:19
deb.rr.devuan.org has IPv6 address 2800:a8:c001::a

Then ping -c 1 each IP address to see which respond (you can probably ignore the IPv6 addresses). Or host 5.9.122.185 to find an addresses name.

Trying to connect to http://deb.devuan.org/merged in a browser is another useful check.

Once you find a working address put it into  /etc/apt/sources.list (keep notes though).

Edit: Crossposted with RedGreen925.

I should have said "But don't let non-root users write into the mountpoint."

By mountpoint I mean the directory in the root filesystem that the other filesystem is going to be mounted on. It does not need the same owner and permissions as the root of the filesystem that will be mounted on it.

Unless you get that clear in your head you will have big problems sorting out what is going on.

NB. It is possible to mount a filesystem on a directory in another mounted filesystem. But that's can cause problems if the intermediate filesystem isn't mounted when you want to mount the second filesystem aand is best avoided unless you have a good reason.

Swap placement will have no effect on performance on a SSD.

On spinning rust it will only have any effect if you are actually using swap space. Seeking from 1 cylinder to another takes longer if they are further apart, so having swap space near to the data files you are accessing at the same time will be slightly faster. But if you are using swap space that often your performance will feel very slow.

I learnt a lot about tuning disks and swap space when I was a MVS systems programmer (back then 64Mb was a big system). Nowadays I'd prefer to just buy more RAM (after checking for software with a memory leak).

Looking at your ping attempt I noticed:
You ping'ed dev.devuan.com which is wrong. As said above try deb.devuan.org (deb not dev and .org not .com).
DNS lookup for dev.devuan.com worked and got the same IP address as I did (199.59.243.227).
The ping didn't get a response for you, but I did when I tried it just now. But ping uses ICMP and devuan uses HTTP or HTTPS to get updates.

So try deb.devuan.org and post output if that fails. You might have ping blocked, you could check that by trying to get to http://deb.devuan.org in a broswer.

The first command the OP (really) should learn is man (short for manual) which tells you what a command does. info is similar but "enhanced" which makes it a bit harder to learn.

The first thing to do when someone/something recommends a command you don't know is to read the man page to see what it should do.

Start with:
man less (less is the pager man uses to display man pages).
man man
man apropos (this lets you search man pages for a given string).

As time passes you will build up a useful knowledge base of UNIX/Linux commands.

Reading another forum I found:

I've copied that rather than posting a link because you have to register to read that forum. And there's not much else there relevant to you. But I though that might help.

It's at https://www.mersenneforum.org/node/2301 … ost1061326 is you want to read it though.

Try df -k /var/run/ and ls -lid /var/run
On my system /var/run/ is a symlink to /run which is a tmpfs. So it's contents will be re-created at every reboot, which will make the -i flag vanish (tmpfs is a filesystem that only exists in ram).

That would explain why chattr -i didn't seem to work. Checking with lsattr might be interesting too.