π ~1 min read
Table of contents
Symptom & Impact
snap install and refresh operations fail due to name resolution errors.
Environment & Reproduction
Ubuntu 20.04 LTS behind custom DNS or proxy settings.
Root Cause Analysis
Snapd cannot resolve or reach store endpoints because DNS/proxy path is invalid.
Quick Triage
Confirm general DNS health and outbound HTTPS access to snap services.
Step-by-Step Diagnosis
Inspect snapd logs, resolver configuration, and proxy environment settings.
Solution – Primary Fix
Correct DNS/proxy config and restart snapd to reload network context.
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Solution – Alternative Approaches
Use apt package equivalent where snap transport is restricted.
Verification & Acceptance Criteria
snap refresh completes and store queries return available revisions.
Rollback Plan
Revert proxy and resolver changes if other services regress.
Prevention & Hardening
Document outbound requirements for snapd in network policy controls.
Related Errors & Cross-Refs
Related to DNS resolver failures and TLS trust chain issues.
Related tutorial: View the step-by-step tutorial for Ubuntu 20.04 LTS.
View all Ubuntu 20.04 LTS tutorials on the Tutorials Hub β
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
See snapcraft docs and Ubuntu snapd troubleshooting references.
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