from microsoft/vscode-remote-release#2518
look for line similar to
\ln /home/#####/.vscode-server/bin/78a4c91400152c0f27ba4d363eb56d2835f9903a/vscode-remote-lock.#####.78a4c91400152c0f27ba4d363eb56d2835f9903a.target /home/#####/.vscode-server/bin/78a4c91400152c0f27ba4d363eb56d2835f9903a/vscode-remote-lock.#####.78a4c91400152c0f27ba4d363eb56d2835f9903a
[13:55:17.276] stderr> ln: failed to create hard link ‘/home/#####/.vscode-server/bin/78a4c91400152c0f27ba4d363eb56d2835f9903a/vscode-remote-lock.#####.78a4c91400152c0f27ba4d363eb56d2835f9903a’: File exists
[13:55:17.276] > Installation already in progress...
Then go delete the .target file
Should be able to install after that!