Fix dpkg contention in VM setup scripts #1255
| Job | Run time |
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| 34s | |
| 33s | |
| 32s | |
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| 49s | |
| 47s | |
| 1m 5s | |
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| 1m 2s | |
| 1m 4s | |
| 1m 11s | |
| 1m 22s | |
| 1m 54s | |
| 2m 14s | |
| 1m 49s | |
| 1m 52s | |
| 2m 1s | |
| 2m 10s | |
| 1m 42s | |
| 2m 22s | |
| 2m 15s | |
| 2m 28s | |
| 32s | |
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| 32s | |
| 45s | |
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| 55s | |
| 58s | |
| 47s | |
| 48s | |
| 1m 1s | |
| 1m 3s | |
| 42m 17s |