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Ubuntu system has lost DNS access

At the most embarrassing time, Firefox on my Ubuntu laptop wouldn't connect to any websites. I've narrowed it down to a DNS issue. I can ping IP addresses, sftp to the computer, etc. The problem affects all applications. I'm running Ubuntu 22.04.4 LTS on a Dell Inspiron laptop. The results are the same whether I attempt access on my home network or at the public library.
Running nslookup on any domain name gives me
`communications error to 127.0.0.53#53: timed out`
three times.
Running `resolvectl status` gives the following output:
~~`Global~~
Protocols: -LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
~~resolv.conf mode: stub`~~
~~`Link 2 (wlp2s0)~~
Current Scopes: none
~~Protocols: -DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported`~~
~~`Link 3 (surfshark_ipv6)~~
Current Scopes: DNS
Protocols: +DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
Current DNS Server: ::1
DNS Servers: ::1
~~DNS Domain: ~.`~~
The Surfrhark reference jumps out at me. I have Surfshark (VPN software) installed but not currently running. I'm wondering if a Surfshark crash left my DNS in a bad state.
Since the machine can't access any domains by name, I'm limited in my options. Installing anything with apt doesn't work. I'm seriously thinking of backing up my data files and reinstalling Ubuntu, since I have nothing irreplaceable on that machine, but I'd like to fix the problem if possible. Any suggestions on how to proceed?

At the most embarrassing time, Firefox on my Ubuntu laptop wouldn't connect to any websites. I've narrowed it down to a DNS issue. I can ping IP addresses, sftp to the computer, etc. The problem affects all applications. I'm running Ubuntu 22.04.4 LTS on a Dell Inspiron laptop. The results are the same whether I attempt access on my home network or at the public library.
Running nslookup on any domain name gives me
`communications error to 127.0.0.53#53: timed out`
three times.
Running `resolvectl status` gives the following output:
```
Global
Protocols: -LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
resolv.conf mode: stub
Link 2 (wlp2s0)
Current Scopes: none
Protocols: -DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
Link 3 (surfshark_ipv6)
Current Scopes: DNS
Protocols: +DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
Current DNS Server: ::1
DNS Servers: ::1
DNS Domain: ~.
```
The Surfrhark reference jumps out at me. I have Surfshark (VPN software) installed but not currently running. I'm wondering if a Surfshark crash left my DNS in a bad state.
Since the machine can't access any domains by name, I'm limited in my options. Installing anything with apt doesn't work. I'm seriously thinking of backing up my data files and reinstalling Ubuntu, since I have nothing irreplaceable on that machine, but I'd like to fix the problem if possible. Any suggestions on how to proceed?

ubuntu dns