Pre-submit Checks

• I have searched Warp bugs and there are no duplicates
• I have searched Warp known issues page and my issue is not there
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• I have technical issue and have included the logs (optional, but helps expedite the bug fix). Log instructions

Describe the bug

When installing Warp on Ubuntu, the repository is added in both .list and .sources formats under /etc/apt/sources.list.d/. This results in duplicate APT source entries and repeated warnings during apt update.

To reproduce

After running apt modernize-sources

Expected behavior

Only one repository definition should be added (preferably .sources, as it's the modern format)
No duplicate warnings during apt update

Screenshots, videos, and logs

Operating system (OS)

Linux

Operating system and version

Ubuntu 26.04

Shell Version

GNU bash, version 5.3.9(1)-release (x86_64-pc-linux-gnu)

Current Warp version

v0.2026.04.29.08.57.stable_01

Regression

No, this bug or issue has existed throughout my experience using Warp

Recent working Warp date

Previous apt version in Ubuntu 24.04

Additional context

No response

Does this block you from using Warp daily?

No

Is this an issue only in Warp?

Yes, I confirmed that this only happens in Warp, not other terminals.

Warp Internal (ignore): linear-label:b9d78064-c89e-4973-b153-5178a31ee54e

None